|
Records Committee review for rare bird sighting of Thayer's Gull near Oak Grove Beach and Saylorville Reservoir Dam, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-23
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull near Oak Grove Beach and Saylorville Reservoir Dam in Polk County, IA on November 23, 1986. Includes a record review document with votes, a summary of the review, and ten documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam Oak Grove Recreation Area
|
Saylorville Reservoir, Polk Co. (Oak Grove Beach and near dam)
|
seen resting on beach and flying over water near dam
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Bob Myers, Mark Proescholdt, Beth Proescholdt, Thomas H. Kent, Jim Fuller, Francis L. Moore, Robert Cecil, and Paul Martsching were submitted. | Elimination of similar species: The darker body plumage and dark tail band eliminate Iceland Gull (Kumlien's form). The smaller size, smaller, more delicate bill, more rounded head, silvery white underwing pattern, more uniform body color, and more uniform upperwing pattern eliminate first winter Herring Gull. | The original documentation form event lasted from 10:50:00/11:55:00 and 15:50:00/16:05:00 on November 23, 1986 and 14:50:00/15:35:00 on November 24, 1986.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull near Saylorville Reservoir Dam and Oak Grove Beach, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-23
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for seven or more Thayer's Gulls near Saylorville Reservoir Dam and Oak Grove Beach in Polk County, IA on November 23, 1986. Includes a record review document with votes, a summary of the review, and seven documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam Oak Grove Recreation Area
|
Saylorville Reservoir, Polk Co.(Oak Grove Beach and near dam)
|
seen resting on beach and flying over water near dam
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Steve Dinsmore were submitted. Other observers include Paul Martsching, Bob Myers, Beth Proescholdt, Mark Proescholdt, and many unidentified other observers. | Elimination of similar species: The darker body plumage and dark tail band eliminate Iceland Gull (Kumlien's form). The smaller size, smaller, more delicate bill, more rounded head, silvery white underwing pattern, more uniform body color, and more uniform upperwing pattern eliminate first winter Herring Gull. | The original documentation form event occurred at various times.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Cottonwood Recreation Area near Saylorville Dam, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-03
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review of a Thayer's Gull at Cottonwood Recreation Area near Saylorville Dam in Polk County, IA on December 3, 1986. Includes a record review document with votes and a documentation form submitted to the committee.
|
Petersen, Peter C.
|
Thayer's Gull
|
Cottonwood Recreation Area
|
Cottonwood Rec. Area below Saylorville Dam. Polk Co
|
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Beth Proescholdt, Mark Proescholdt, Steve Dinsmore, Gil Sandvick, and unidentified other observers. | Elimination of similar species: [...] Birds call not distinguishable from Ring-billed Gulls feeding with it. [...] Herring Gull eliminated by lack of sharp contrast between primaries + remainder of mantle + back and whitish undersides of primaries. | The original documentation form event lasted from 10:02:00/10:03:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Reservoir, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-03
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review of two Thayer's Gulls at Red Rock Reservoir in Marion County, IA on December 3, 1986. Includes a record review document with votes and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lake Red Rock
|
Red Rock Reservoir
|
reservoir with ice and open water.
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Cal Knight, Bernie Knight, and Jim Fuller. | Elimination of similar species: Herring Gull --see above. [...] The bird is not any larger than some of the ring-bills--some of the ring-bills are smaller. The larger ring-bills are almost as big as this bird, and it is distinctly smaller than a number of Herring Gulls in the same field. The bill is much smaller and thinner; the head is small. [...] The striking thing about this bird is the size, bill shape and head shape compared to the nearby herrings and very distinct smudge through the eye." | The original documentation form event lasted from around 09:10:00 for several minutes and 15:55:00 for many minutes.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records committee review for rare bird sighting of Thayer's Gull at Red Rock Reservoir, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-13
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for two to five Thayer's Gulls at Red Rock Reservoir in Marion County, IA on December 13, 1986. Includes a record review document with votes, a summary of the review, and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Lake Red Rock
|
Red Rock Res., Marion Co.-below dam and near the Hwy 14 bridge
|
resting on sand bar below dam and feeding near open water on main lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Mark Proescholdt, Tom Kent, and Tom Staudt. | Elimination of similar species: The dark tail band and fairly dark body coloration should eliminate Iceland Gull. The smaller bill, rounder head, smaller size, more even body coloration, and pale undersides of the wings eliminates first-winter Herring Gull. | The original documentation form event occurred around 10:00:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 19, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-17
|
1994-11-04
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 19 in Keokuk in Lee County, IA on December 17, 1986. Includes a record review document with votes, summary of review, and a documentation form submitted to the committee.
|
Cecil, Robert I.
|
Thayer's Gull
|
Lock Number 19
|
Lock and Dam 19, Keokuk, Lee Co., Iowa
|
River Rapids
|
The documentation form by Robert Cecil is the only one submitted and forms the basis of this record. Another observer includes Francis L. Moore. | Elimination of similar species: Herring Gull:Bill size, pattern of wingtips on upper and under surface of wings. Ringbill: size. Kumlien's Iceland: black rather than gray in wintip [sic] (Tom Kent, personal communication). Adult Glaucous has no black in wingtips. | The original documentation form event occurred at various times on the various dates listed on the documentation form.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Island View Park at Rathbun Reservoir, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-20
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for three Thayer's Gulls at Island View Park at Rathbun Reservoir in Appanoose County, IA on December 20, 1986. Includes a record review document with votes, a summary of the review, and two documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Island View Park
|
Rathbun Reservoir, Appanoose Co. (Island View East and West Areas)
|
sitting on ice and feeding on open water with other gulls
|
The documentation form by Steve Dinsmore forms the basis of this record. Another documentation form by Ray Cummins was submitted. Another observer includes Randy Strough. | Elimination of similar species: The first-year birds were separated from first-year Iceland Gull by the distinct tail band and the darker primaries and from first-year Herring Gull by head shape, bill size, more uniform body color, and the silvery-white underwing. The adult bird was separated from an adult Iceland Gull by size, bill shape, and more black (still not too much, though) in the wingtips and from an adult Herring Gull by head shape, bill size, and paler wingtips. | The original documentation form event lasted from 10:05:00/10:30:00 and 13:30:00/13:54:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 19, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-21
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 19 in Keokuk in Lee County, IA on December 21, 1986. Includes a record review document with votes, a summary of the review, and a documentation form submitted to the committee.
|
Cecil, Robert I.
|
Thayer's Gull
|
Lock Number 19
|
Lock and Dam 19, Miss. River, Keokuk, Lee Co, Iowa
|
River rapids.
|
The documentation form by Robert Cecil is the only one submitted and forms the basis of this record. Another observer includes Doug Reeves. | Elimination of similar species: First year Herring much more "contrasty"--see above. Kumlien's Iceland Gull...According to Seabirds (Harrison), 1st year Iceland is more pale, tail uniform gray. Overall body coloration is more like 1st year Glaucous--bird I saw was darker than 1st year Glaucous. [...] The important thing about this uniformity that the accompanying first year Herring Gulls had much contrast, showing whitish head, darker wingtips, dark at the tip of the underwings (sometimes), and most obviously, much darker secondaries, creating a dark trailing edge to the wings. Their general color was a darker chocolatey brown. [...] BILL: Pinkish--noticably [sic] smaller that [sic] Herrings. This is pretty subjective, but at about 2/3 of the way across the river at the dam (maybe one third mile) the bill on a Herring can be easily seen through my scope. [...] A very indistinct darkening (wing, upper surface) of the first two or three primaries. The mark had to be looked for to be seen--on the Herring it was much more evident. [...] At some times, the bird showed secondaries that were slightly darker than the rest of the wing. Slightly should be emphasized--at no time was it even close to the darkness of the secondaries of the first year Herring. [...] There was a very slight and indistinct darkening to the first two or three primaries, but this had to be looked for carefully. I have also seen a number of 1st year Herring Gulls that fit this description, but all have a distinct window at base of primaries. | The original documentation form event occurred at various times during the date range of sightings on the documentation form.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock 15 in Davenport, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-24
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock 15 in Davenport in Scott County, IA on December 24, 1986. Includes a record review document with votes and a documentation form submitted to the committee.
|
Petersen, Peter C.
|
Thayer's Gull
|
Lock and Dam 15
|
Lock 15, Davenport
|
General: Mississippi River Specific: just below roller dam
|
The documentation form by Peter C Petersen is the only one submitted and forms the basis of this record. Other observers include Tim Dwyer and Jerry White. | Elimination of similar species: Herring Gull - wing tips not black on this bird, + its eye was dark. Iceland (Humelius) - wing tips not as pale grey, legs not pale pink. | The original documentation form event lasted from 10:10:00/10:15:00 on December 24, 1986 and 14:40:00/14:42:00 on December 25, 1986.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 19 in Keokuk, 1987
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1987-01-03
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 19 in Keokuk in Lee County, IA on January 3, 1987. Includes a record review document with votes and two documentation forms submitted to the committee.
|
Moore, Francis L.
|
Thayer's Gull
|
Lock Number 19
|
Below lock and dam 19, Keokuk, Lee Co., Iowa
|
Open water below lock and dam 19
|
The documentation form by Francis L. Moore forms the basis of this record. Another documentation form by Steve Dinsmore was submitted. Another observer includes Robert Cecil. | Elimination of similar species: Herring Gull has more black in the primaries with a grayer mantle, a larger bill and heavier and bigger head. The under surface of the primaries of a Herring is also darker and has the darkness well into the primaries from the tips. | The original documentation form event lasted from 10:30:00/10:40:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Reservoir, 1987
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1987-01-03
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Reservoir in Marion County, IA on January 3, 1987. Includes a record review document with votes and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lake Red Rock
|
Red Rock Res., Marion Co., Iowa
|
reservoir, partly frozen
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Tom Staudt, Steve Dinsmore, and unidentified other observers. | Elimination of similar species: The uniform coloration and lack of dark wing tips were the main marks used to separate it from Herring Gull. | The original documentation form event lasted from approximately 13:30:00/13:45:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Reservoir Dam, 1987
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1987-12-02
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for two or more Thayer's Gulls at Saylorville Reservoir Dam in Polk County, IA on December 2, 1987. Includes a record review document with votes and five documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam
|
Saylorville Reservoir, Polk Co.
|
sitting on ice with other gulls
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Francis L. Moore, Steve Dinsmore, and Mark Proescholdt were submitted. Other observers include Andy Fix, Beth Proescholdt, Eugene Armstrong, Eloise Armstrong, Bob Cecil, Bery Engebretsen, Jim Sinclair, and many unidentified observers. | Elimination of similar species: The overall dark color of the bird and the lack of paler wingtips eliminates first-winter Iceland Gull. The translucent flight feathers, uniform body color, lack of a "window" on the upperwing, smaller, thinner bill, rounder head, dark smudge around the eye, and smaller size eliminates first-winter Herring Gull. The uniform body color, lack of a dark tail band, and translucent flight feathers eliminates first-winter Lesser Black-backed Gull. | The original documentation form event lasted from 08:00:00/08:05:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 15 in Davenport, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-01-01
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 15 in Davenport in Scott County, IA on January 1, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lock and Dam 15
|
Lock + Dam 15, Davenport, Scott Co, IA
|
Mississippi R.
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Francis Moore and Dick Kraemer. | Elimination of similar species: [...] There were many first year Herrings that were darker with dark wingtips. We also saw, but not at same time, a larger, slightly lighter gull without tail band that we identified as a first year Glaucous Gull. It was consistently larger than Herring and heavier bodied. Uniform color, white flight feathers from below separate bird from Herring. Size and tail band separate from Glaucous. | The original documentation form event lasted from 10:15:00/10:45:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull north of Jester Park at Saylorville Reservoir, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-11-30
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull north of Jester Park at Saylorville Reservoir in Polk County, IA on November 30, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Jester Park
|
Saylorville Reservoir, Polk Co.-north of Jester Park
|
feeding in river channel with thousands of other gulls
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The bill and leg color and size eliminates all gulls except Herring, Thayer's, and Iceland gulls. The uniform dark color of the wings, lack of a lighter "window" on the inner primaries, and the silvery color of the underside of the flight feathers eliminates 1st-winter Herring and Iceland gulls. | The original documentation form event lasted from 13:38:00/14:55:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull north of Jester Park at Saylorville Reservoir, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-11-30
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for one to three Thayer's Gulls north of Jester Park at Saylorville Reservoir in Polk County, IA on November 30, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Jester Park
|
Saylorville Reservoir, Polk Co.-north of Jester Park
|
feeding in river channel with thousands of other gulls
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include many unidentified other observers. | Elimination of similar species: The bill and leg color and size eliminates all gulls except Herring, Thayer's, and Iceland gulls. The uniform dark color of the wings, lack of a lighter "window" on the inner primaries, and the silvery color of the underside of the flight feathers eliminates 1st-winter Herring and Iceland gulls. | The original documentation form event lasted from 13:38:00/14:55:00 on November 30, 1988.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-12-13
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on December 13, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Johnson, Ann
|
Thayer's Gull
|
Red Rock Dam
|
below dam - Lake Red Rock, Marion Co, IA
|
dam on Des Moines River forming reservoir; open river with islands
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: Ring-billed eliminated by size and leg color. Herring eliminated by head shape and eye color. Iceland eliminated by eye color, mantle color, and size and shape of head. | The original documentation form event lasted from 15:01:00/15:03:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Dam, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-12-30
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for two Thayer's Gulls at Saylorville Dam in Polk County, IA on December 30, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Johnson, Ann
|
Thayer's Gull
|
Saylorville Dam
|
Saylorville Lake, Polk Co., IA
|
dam on Des Moines River forming reservoir
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: The primary identification was done through the size and shape of the head. Other similar gulls do not share this "dove head." The adult was confirmed by the silvery underwings, not shared by similarly gray-mantled gulls, and the first year bird was confirmed by the uniformity of its body color. | The original documentation form event lasted from 15:40:00/15:55:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Pool 19 on the Mississippi River near Montrose, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-12-31
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Pool 19 on the Mississippi River near Montrose in Lee County, IA on December 31, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Pool 19
|
Pool 19 of Mississippi R., near Montrose, Lee Co., IA
|
resting on ice and flying over river with other gulls
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Another observer includes Bart Ballard. | Elimination of similar species: wing pattern, tail pattern, rounder head, and even color of body eliminates similar Herring Gull. | The original documentation form event lasted from 10:15:00/10:25:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull near Horse Island near Davenport, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-01-02
|
1993-08-05
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull near Horse Island near Davenport in Scott County, IA on January 2, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
|
Petersen, Peter C.
|
Thayer's Gull
|
Horse Island
|
downstream tip of Enchanted Island. Davenport, Scott Co. IA
|
Mississippi River - edge of open water, Iowa side
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Brian Blevins and Corey Blevins. | Elimination of similar species: Herring Gull - eye light, wing tips black with white windows, bill larger than Thayers. California Gull - eye light, wing tips black with white windows, yellow legs. | The original documentation form event lasted from 13:35:00/13:50:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Dam, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-01-28
|
1993-08-05
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Saylorville Dam in Polk County, IA on January 28, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
|
Johnson, Ann
|
Thayer's Gull
|
Saylorville Dam
|
Saylorville Lake, Polk Co., IA
|
dam on Des Moines River forming reservoir
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: The primary identification was done through the size and shape of the head. Other similar gulls do not share this "dove head." The bird was confirmed by the silvery underwings and very little dark coloring on the upper side of the primaries, characteristics not shared by similarly gray-mantled gulls. | The original documentation form event lasted from 08:40:00/08:40:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull near Lindsay Park in Davenport, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-02-18
|
1993-08-05
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull near Lindsay Park in Davenport in Scott County, IA on February 18, 1989. Includes a record review document with votes and a documentation form submitted to the committee for this sighting.
|
Petersen, Peter C.
|
Thayer's Gull
|
Lindsay Park
|
Lindsay Park Boat Club harbor, east edge of Davenport Scott Co.
|
On ice shelf along Mississippi River, 40 yards from sea wa[...]
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record.Other observers include Walter Zuurdeeg and many unidentified observers. | Elimination of similar species: [...] Immature gull same size as nearby Herring Gulls. [...] Head smaller than Herrings, bill more slight, black, + not thickened at the tip, compared to Herrings. When wings spread - this was seen twice, the upper surface seemed fairly uniform with no dark tip pattern as in the Herrings. | The original documentation form event lasted from 09:50:00/09:55:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Bettendorf, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-02-18
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1993-08-05
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Rare birds documentation form
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Records Committee review for a Thayer's Gull at Bettendorf in Scott County, IA on February 18, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
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Johnson, Ann
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Thayer's Gull
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Bettendorf
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Mississippi River, Bettendorf, Scott Co., IA
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seen from shore just south of I80 in area of cabins
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The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: The primary identification was done through the size and shape of the head. The bird was lighter in color than the first-winter herring gulls in the same area and the wing pattern on both upper and lower sides eliminated herring, ring-billed and Iceland gulls. | The original documentation form event lasted from 12:42:00/12:42:00.
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Iowa Ornithologists' Union | MS 166
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11
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3
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Records Committee review for rare bird sighting of Thayer's Gull at IPL Ponds in Pottawattamie County, 1989
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Administrative records Field notes
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Bird watching Ornithology Ornithology--Societies, etc
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1989-10-29
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1993-08-06
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Rare birds documentation form
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Records Committee review for a Thayer's Gull at IPL Ponds in Pottawattamie County, IA on October 29, 1989. Includes a record review document with votes and three documentation forms submitted to the committee.
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Grenon, Alan G.
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Thayer's Gull
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MidAmerican Energy Ponds
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Iowa, Pottawattamie County, south of Council Bluffs, the north pond of the Iowa Power and Light plant's ponds, two miles north of the county line (three miles north of the Bellevue exit on I-29), just east of Interstate highway 29.
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The documentation form by Alan G. Grenon forms the basis of this record. Other documentation forms by Babs Padelford and Ross Silcock were submitted. Other observers include B.J. Rose, Doug Rose, Loren Padelford as well as four unidentified observers. | Elimination of similar species: The most likely similar species are Iceland and Herring Gulls. Iceland Gull (first winter) is eliminated by the combination of the following characters: wing-tip darker than body at rest; wing-tip and secondaries darker above than remainder of wing; tail marked above by a darker band covering most of the distal portion; a possible darker area around the eye. Herring Gull (first winter) is eliminated by the combination of the following characters: wing-tip at rest brown-tan, not black; wing-tip and secondary bar tan in flight, not black; primaries with thin, pale tips; tail bar tan, not black; bill all dark; bill and head delicate; bill thin. Glaucous Gull would have been larger relative to Ring-billed Gulls, with a massive bill light with a dark tip, large head, and wing-tips and secondaries would not have been darker than other upper parts. California Gull (first winter) would have black or near-black primaries, secondaries, tail, and a mostly pale bill with a black tip. Glaucous-winged Gull and hybrids thereof eliminated by bill and head structure and body size all smaller/finer in this bird, tail and wing pattern. AG. | The original documentation form event occurred around 09:30:00 on October 29, 1989, from 11:30:00/12:15:00 and around 14:00:00 on the October 30, 1989.
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Iowa Ornithologists' Union | MS 166
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11
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3
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Records Committee review for rare bird sighting of Thayer's Gull at North Overlook Beach at Red Rock Reservoir, 1989
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Administrative records Field notes
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Bird watching Ornithology Ornithology--Societies, etc
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1989-11-06
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1993-08-06
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Rare birds documentation form
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Records Committee review for a Thayer's Gull at North Overlook Beach at Red Rock Reservoir in Marion County, IA on November 6, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
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Johnson, Ann
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Thayer's Gull
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North Overlook Park
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North Overlook Beach, Lake Red Rock, Marion Co, IA
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Sandy beach on man-made reservoir
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The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: Iceland Gull - basically eliminated by darker color and narrow chocolate edges to outer primaries. Kumlien's - presence of tail band would seem to eliminate Herring - eliminated by combination of: structure and size of body and bill; shape of head; more uniform coloration above, especially lighter colored primaries; light flight feathers from below contrasting with darker wing lining; lighter color of tail band | The original documentation form event lasted from 10:30:00/10:35:00.
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Iowa Ornithologists' Union | MS 166
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11
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3
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Records Committee review for rare bird sighting for Thayer's Gull at Red Rock Dam, 1989
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Administrative records Field notes
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Bird watching Ornithology Ornithology--Societies, etc
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1989-11-08
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1993-08-06
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Rare birds documentation form
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Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 8, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
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Proescholdt, Beth
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Thayer's Gull
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Red Rock Dam
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Red Rock
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below dam
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The documentation form by Beth Proescholdt is the only one submitted and forms the basis of this record. Another observer includes Mark Proescholdt. | Elimination of similar species: It was lighter + more evenly colored than a Herring Gull, larger than Ring-billed, too dark for an Iceland too small for a Glaucous. | The original documentation form event lasted from 08:50:00/09:00:00.
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Iowa Ornithologists' Union | MS 166
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11
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3
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