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
|
1989-11-28
|
1993-08-06
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Saylorville Dam in Polk County, IA on November 28, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam
|
Saylorville Reservoir, Polk Co.-above dam
|
feeding with other gulls on large reservoir
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Bob Myers. | Elimination of similar species: The size, uniform body color, pale underside of the flight feathers, and dark bill eliminates othr [sic] gulls. Iceland Gull eliminated by uniform wing color without noticeably lighter wingtips. | The original documentation form event lasted from 16:15:00/16:20:00.
|
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 at Saylorville Dam, 1981
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-12-10
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Saylorville Dam in Polk County, IA on December 10, 1981 recorded incorrectly as 1982 on the documentation form. Includes a record review document with votes, correspondence and commentary about the sighting, and a documentation form submitted to the committee.
|
Schaufenbuel, Joseph P.
|
Thayer's Gull
|
Saylorville Dam
|
Above and below Saylorville Dam
|
Open water, rocky shore and ice covered pond.
|
The documentation form by Joe Schaufenbuel is the only one submitted and forms the basis of this record. | Elimination of similar species: [...] Nearly the same size as an immature Herring Gull, but neck seemed thinner, head smaller. Bill was same length as a Herring Gull's but was blunter, not as strongly hooked. [...] The primaries were not nearly as dark as immature (1st year) or 2nd year Herring Gulls and was of a much different color than the black color of that species. Primaries and tail were nearly the same color. [...] In flight this bird could be easily picked out from the immature Herring Gulls at considerable distances. Using 7x35 binoculars the beige color of the upper surface of wings and translucent underwing could be detected as far as three-quarters of a mile. There were also three other birds that resembled this particular bird though they appeared darker on the upperparts. However I was unable to get close observations of these birds. The bird I observed closely and documented had one primary feather missing and aided in tracking the bird from day to day.
|
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 a Thayer's Gull at Red Rock Reservoir Dam, 1985
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1985-12-10
|
1993-09-03
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Reservoir Dam in Marion County, IA on December 10, 1985. Includes a record review document with votes, an article in Iowa Bird Life, and six documentation forms submitted to the committee.
|
Bendorf, Carl J.
|
Thayer's Gull
|
Red Rock Dam
|
Red Rock Res. Tailwater
|
|
The documentation form by Carl J. Bendorf forms the basis of this record. Other documentation forms by Thomas H. Kent, Francis L. Moore, Bob Myers, Beth Proescholdt and Mark Proescholdt, and Dennis Thompson were submitted. Other observers include Joe Schaufenbuel, Darwin Koenig, Steve Dinsmore, Eugene Armstrong, Eloise Armstrong, and many unidentified observers. | Elimination of similar species: Thayer's Gull is a difficult bird to identify. In researching this problem, I have found several helpful sources in addition to the standard field guides and I have tried to understand what it takes to know a Thayer's Gull when you see one. Nearly every reference makes it clear that Thayer's cannot be identified on the basis of one or two positive field marks. It takes a combination of characters to come to a conclusion of any certainty. In discussing this particular observation, I will examine each of the fieldmarks and compare and contrast to similar species with liberal reference to the literature, especially Lehman (1980). The most likely similar gulls in this case are 1st winter Herring and 1st winter Iceland (Kumlien's). The Kumlien's form is the darker form of the Iceland Gull and is the form that breeds in the Baffin Island area and winters mainly on the Atlantic coast. Lehman's article deals mainly with Kumlien's. Several similarly sized and possible but unlikely candidates can be eliminated rather quickly. A 1st winter California should not have an all dark bill and would show much darkening in the primaries in flight. Lesser Black-backed Gull could be about the right size, but in flight a 1st winter bird should show darker primary and secondary coverts, more extensively dark primaries, even compared to Herring Gull. A 1st summer Slaty-backed Gull is also light uniform brown with an all dark bill, but it should exhibit extensive darkening in the primaries on the upper wing. A 1st winter Glaucous-winged Gull would be very similar to Thayer's but should be larger, with a larger bill, and less mottling to the body color. Except for the first two, one would probably not consider the likelihood of their occurrence in Iowa to be very great. One hybrid, Glaucous-winged X Western, might be similar but should have a quite heavy bill. [...] Summary: Of the most likely similar species, 1st winter Herring Gull and 1st winter Kumlien's Iceland Gull, each is eliminated by one or more of the features discussed above. The wing pattern is especially damaging to the possibility of Herring, along with the bill shape and size. Iceland is ruled out by the presence of the noticeable tail band and by the darker secondaries on the upper wing. To identify a Thayer's Gull, one must see a combination of field marks. I feel that the bird I saw at Red Rock is consistent on every point.| The original documentation form event lasted from 14:15:00/14:45:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-10-24
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on October 24, 1991. 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, Red Rock Reservoir, Marion Co., IA
|
Gravel bar and open river
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: Herring Gull was eliminated by the light and uniform body color, brown as opposed to blackish primaries and tail band, lack of a window from above, and lack of any color to the underside of the primaries. Iceland Gull was eliminated based on the darker secondaries and wide, brown tail band. | The original documentation form event lasted from 16:50:00/17:15:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting for Thayer's Gull at Red Rock Dam, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-11-08
|
1993-08-06
|
Rare birds documentation form
|
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.
|
Proescholdt, Beth
|
Thayer's Gull
|
Red Rock Dam
|
Red Rock
|
below dam
|
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.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-11-25
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 25, 1991. Includes a record review document with votes and two documentation forms submitted to the committee.
|
Johnson, Ann
|
Thayer's Gull
|
Red Rock Dam
|
Below dam, Red Rock Reservoir, Marion Co., IA
|
Gravel bar and open river
|
The documentation form by Ann Johnson forms the basis of this record. Another documentation form by Thomas H. Kent was submitted. Other observers include Jim Fuller, Dick Tetrault, and Tim Schantz. | Elimination of similar species: Herring Gull was eliminated by the light and uniform body color, pale gray primaries, secondaries and tailband, lack of a window from above, and lack of any color to the underside of the primaries. The bird certainly had the overall coloration of a first year Iceland Gull. However, Iceland Gull was eliminated based on the darker secondaries, complete gray tail band, and the darker webs to the outer primaries from above. | The original documentation form event lasted from 16:10:00/16:50:00 on November 25, 1991 and 13:50:00/14:05:00 on November 28, 1991.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1990
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1990-11-21
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 21, 1990. Includes a record review document with votes and a documentation form submitted to the committee.
|
Fuller, James L
|
Thayer's Gull
|
Red Rock Dam
|
Below Red Rock Dam- Marion County
|
River
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include Ann Johnson, Chuck Fuller, and Jane Fuller. | Elimination of similar species: Herring Gull (first winter) compared above. [...] I first saw this bird flying, and the underwing was translucent throughout the primaries to the end of the wing (Herring Gull had dark outer primaries, although most also had a lighter window type area medial to this dark area). The bird was about the same size or a little smaller than the Herrings. The upperwing in flight was much lighter in the primaries than the first winter herrings. [...] It had a more rounded head than the herrings. [...] It's color was more uniform than the herrings and also lighter- a brownish color. There was a dark smudge around the eye. The feather edging (whitish) provided more contrast with the brown on the back than in the herrings, and the folded tail was brownish, not black. When in flight the tail band was brownish not blackish like the herrings. | The original documentation form event lasted from 13:15:00/13:45:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-12-07
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on December 7, 1991. Includes a record review document with votes and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Red Rock Dam
|
Red Rock Res., Marion Co., IA
|
below dam on river
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include around twenty unidentified observers on IOU field trip. | Elimination of similar species: Much lighter and more uniform than 1st winter Herring Gulls flying in area. | The original documentation form event lasted from 08:00:00/09:00:00.
|
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 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 at North Overlook Beach at Red Rock Reservoir, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-11-06
|
1993-08-06
|
Rare birds documentation form
|
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.
|
Johnson, Ann
|
Thayer's Gull
|
North Overlook Park
|
North Overlook Beach, Lake Red Rock, Marion Co, IA
|
Sandy beach on man-made reservoir
|
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.
|
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 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 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 Lock and Dam 19 at Keokuk, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-02-16
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 19 at Keokuk in Lee County, IA on February 16, 1991. Includes a record review document with votes and a documentation form submitted to the committee.
|
Allen, Reid I.
|
Thayer's Gull
|
Lock Number 19
|
Lock & Dam #19 - Keokuk, Iowa
|
River channel with open water below dam extending 3/4 mile from dam
|
The documentation form by Reid Allen is the only one submitted and forms the basis of this record. Other observers include Pam Allen, Eugene Armstrong, and Eloise Armstrong. | Elimination of similar species: First-winter Herring gulls (many were present) had blackish wingtips. Juvenile Iceland gull wingtips lack dark edging on primaries as do those on Glaucous-winged Gull. | The original documentation form event lasted from approximately 10:30:00/10:50:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 15 near Davenport, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-12-31
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 15 near Davenport in Scott County, IA on December 31, 1991. 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 River
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: Translucent flight feathers and upper wing pattern and lighter tail band separate from Herring Gull | The original documentation form event lasted from 14:30:00/14:35:00.
|
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 at Lock and Dam 15 in Davenport, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-12-17
|
1993-08-06
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lock and Dam 15 in Davenport in Scott County, IA on December 17, 1989. Includes a record review document with votes and a documentation form submitted to the committee.
|
Blevins, Brian L.
|
Thayer's Gull
|
Lock and Dam 15
|
Just above the Lock + Dam 15 (Davenport, Ia)
|
Frozen ice above the dam in the Mississippi River
|
The documentation form by Brian Blevins is the only one submitted and forms the basis of this record. Other observers include Corey Blevins and Lewis Blevins. | Elimination of similar species: Herring Gull - eliminated by the dark eye and by the lack of black on the primary tips. | The original documentation form event lasted from 15:30:00/15:42:00.
|
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 Lake Manawa, 1981
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-12-05
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Lake Manawa in Pottawattamie County, IA on December 5, 1981. Includes a record review document with votes, correspondence and commentary about the sighting, and a documentation form submitted to the committee.
|
Silcock, W. Ross
|
Thayer's Gull
|
Lake Manawa
|
Lake Manawa
|
|
The documentation form by W. Ross Silcock is the only one submitted and forms the basis of this record. | Elimination of similar species: [...] Smaller than adult Herring Gull (winter plumage, red spot end of lower mandible) beside it, legs a little pinker. Larger than Ring-billed Gulls- flock of 14 adjacent. [...] Headmuch [sic] smaller relative to body than in the Herring Gull- also flatter-appearing. [...] 1. Bill was black (or very dark); this , combined with the rather pale underparts relative to the rest of the (also rather pale) plumage tends to rule out a first year Herring Gull. 2. Bill and head size and shape were not as heavy-appearing as in Herring Gull. Direct comparison with adjacent adult Herring Gull was very useful in deciding this. [...] 5. Size and pinker legs than Herring Gull are not sure characters, but lend support to identification as Thayer's Gull.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at IPL Ponds in Pottawattamie County, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-10-29
|
1993-08-06
|
Rare birds documentation form
|
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.
|
Grenon, Alan G.
|
Thayer's Gull
|
MidAmerican Energy Ponds
|
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.
|
|
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.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Record Committee review for rare bird sighting of Thayer's Gull at Gray's Lake, 1991
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-11-30
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Gray's Lake in Polk County, IA on November 30, 1991. Includes a record review document with votes and a documentation form submitted to the committee.
|
Cecil, Robert I.
|
Thayer's Gull
|
Grays Lake
|
Gray's Lake, Des Moines, Polk County, IA
|
Lake with some open water
|
The documentation form by Bob Cecil is the only one submitted and forms the basis of this record. Another observer includes Mary Michelle Cecil. | Elimination of similar species: Herring much more "contrasty", including dark secondary bar, dark tail band, very dark towards ends of primaries. This bird was smaller than 1st wither [sic] Herring, as well as paler brown. | The original documentation form event lasted from 10:30:00/11:00:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|