|
Rare bird documentation form for Thayer's Gull south of Muscatine, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-12-28
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull south of Muscatine in Muscatine County, IA on December 28, 1997.
|
McKay, Kelly
|
Thayer's Gull
|
Muscatine
|
just south of Muscatine, IA., Muscatine county standing on ice shelves.
|
|
The documentation form by Kelly J. McKay is the only one submitted and forms the basis of this record. Other observers include Gerry White. | Elimination of similar species: The bird was about the size of a herring gull (slightly smaller), but much paler.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
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Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 14, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-12-24
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 14 in Scott County, IA on December 24, 1995.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 14
|
Lock + Dam 14, Scott Co.
|
Mississippi R., on ice in backwater near dam
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: Size, yellow legs, not pure black eliminates other dark-mantled gulls. | The original documentation form event lasted from 08:40:00/08:50:00 approximately.
|
Iowa Ornithologists' Union | MS 166
|
34
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36
|
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Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-02-04
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Scott County, IA on February 4, 1995.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Above Lock and Dam 15, Davenport, Scott Co., IA
|
Mississippi River, river open.
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include several unnamed people. | Elimination of similar species: The size and mantle color exclude Great Black-backed Gull. The mantle was too dark for a California Gull. Slaty-backed Gull would likely appear larger, have a darker mantle, and more white in tertials. | The original documentation form event lasted from 12:30:00/13:00:00 estimated.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-02-05
|
1995-02-21
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Scott County, IA on February 5, 1995 and February 12, 1995.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Mississippi River above Lock & Dam #15 (Scott County)
|
|
The documentation form by James Fuller is the only one submitted and forms the basis of this record. Other observers include Jim Scheib, Thomas Kent, Dan Dorrance, Barker, Peter C. Petersen, Eloise Armstrong, and Eugene Armstrong. | Elimination of similar species: The only other dark mantled gull with yellow legs is the Yellow-footed Gull. That bird has never been seen away from the extreme southwest portion of the country, and it should be much larger. | The original documentation form event lasted from 08:30:00/09:00:00 on February 5, 1995 and 11:40:00/11:55:00 on February 12, 1995.
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Iowa Ornithologists' Union | MS 166
|
34
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36
|
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Rare bird documentation form for Lesser Black-backed Gull at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-29
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Saylorville Reservoir in Polk County, IA on November 29, 1986.
|
Dinsmore, Stephen J.
|
Lesser Black-backed Gull
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
sitting on ice above dam
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Peter Wickham, Mark Brogie, Barb Wilson, Tanya Bray, and Bery Engebretsen. | Elimination of similar species: Great Black-backed Gull was eliminated by the smaller size, contrast between the wingtips and the rest of the wing, and by the heavy streaking on the head (head should be mostly white on a Great Black-backed Gull). California Gull was eliminated by the darker mantle, darker underwing and dark carpal bar, lack of a dark spot on the bill, and by the dark smudge at the base of the bill (this is characteristic of 3rd summer Lesser Black-backed Gulls and is never present on California Gulls). | The original documentation form event lasted from 10:08:00/12:10:00.
|
Iowa Ornithologists' Union | MS 166
|
34
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36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Cedar Lake, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-05
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Cedar Lake in Linn County, IA on January 5, 1992.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Cedar Lake
|
Cedar Lake, Linn Co., Iowa
|
backwater lake and cooling pond with some ice
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: The leg color and size eliminate other dark mantled gulls. | The original documentation form event lasted from 09:50:00/10:00:00 and 10:30:00.
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Iowa Ornithologists' Union | MS 166
|
34
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36
|
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Rare bird documentation form for Lesser Black-backed Gull at Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-11
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on January 11, 1992.
|
Petersen, Peter C.
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Miss. R. between Bettendorf + Moline, Scott + R.I. Cos.
|
river channel
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. | Elimination of similar species: Great Black-backed - back not black, too small. Slaty-backed - a bit small, trailing edge of wing with narrow, not wide, white edge. Western - a bit small bill not larger + heavier than the several nearby Herrings. | The original documentation form event lasted from 08:50:00/09:00:00.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-17
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Davenport in Scott County, IA on January 17, 1992.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Above Lock + Dam 15, Davenport, IA
|
Frozen river
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Jim Fuller. | Elimination of similar species: Size and leg color eliminate other dark mantled gulls. | The original documentation form event lasted from 13:30:00/14:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
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Rare bird documentation form for Lesser Black-backed Gull at Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-31
|
1992-02-07
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on January 31, 1992 and February 1, 1992.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Mississippi River between Moline, Illinois and Bettendorf, Iowa.
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include Charles Fuller and Jane Fuller. | Elimination of similar species: The only other dark mantled gull with yellow legs is Yellow-footed Gull, which has never been seen outside of the extreme southwestern part of the country. Yellow-footed gull is also larger than the Herring gull, but this bird was smaller in general size. | The original documentation form event lasted from 14:35:00/14:45:00 on January 31, 1992 and 09:50:00/10:00:00 on February 1, 1992.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
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Rare bird documentation form for Lesser Black-backed Gull on the Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-02-02
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull on the Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on February 2, 1992.
|
Petersen, Peter C.
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Miss. River between Bettendorf, Scott Co., IA + Moline, R.I. Co., IL.
|
Main channel of Miss. River
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Ann Johnson and Gerald White. | Elimination of similar species: Great-Black-backed- seen with one, much smaller, mantle not black. Slaty-backed. This bird smaller than Herrings, legs were yellow. | The original documentation form event lasted from 13:30:00/13:35:00.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Greencastle Road at Coralville Reservoir, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-19
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Greencastle Road at Coralville Reservoir in Johnson County, IA on December 19, 1993.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Coralville Lake
|
East of the north end of the Greencastle Road at the Coralville Reservoir (Johnson County).
|
Shallow water and mudflats.
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include John McClure, Chris Edwards, and Jonnie Ellsworth. | Elimination of similar species: All other dark mantled gulls have a larger size. They also have pink legs, with the exception of Yellow-footed Gull, which has never been known to wander from Baja and Southern California. Yellow-footed gull is also considerably larger. No one disagreed with identification. | The original documentation form event lasted from 12:55:00/13:15:00.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull in the Cedar River at Cedar Rapids, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-18
|
1994-01-06
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull in the Cedar River at Cedar Rapids in Linn County, IA on December 18, 1993.
|
Wickham, Peter P.
|
Lesser Black-backed Gull
|
Cedar Rapids
|
Cedar River, on sandbar across from Cargill plant, Cedar Rapids, IA
|
Standing, walking around on sandbar
|
The documentation form by Peter Wickham is the only one submitted and forms the basis of this record. | Elimination of similar species: The dark mantle, yet whitish head, neck, and underparts identified it as an adult gull, and immediately eliminated Herring, Ring-billed and other gray or whitish-backed gulls. It was too small for Great Black-backed Gull, which has flesh-colored legs anyway, or Slaty-backed Gull, which has pinkish legs. The mantle wasn't truly black, as a Great Black-backed mantle would be. | The original documentation form event lasted from 14:15:00/14:25:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Coralville Reservoir, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-18
|
1993-12-19
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Coralville Reservoir in Johnson County, IA on December 18, 1993.
|
Bendorf, Carl J.
|
Lesser Black-backed Gull
|
Coralville Lake
|
Coralville Reservoir, Johnson County, Iowa
|
upper reaches of the Coralville Reservoir
|
The documentation form by Carl Bendorf is the only one submitted and forms the basis of this record. Other observers include Lanny Haldy, Randy Graesser, Dan Ray, Angela Ray, Kathleen Kuenstling, Randall Pinkston, Thomas Kent, Jim Fuller, and others. | Elimination of similar species: Of about 500 gulls total, nearly 90% were adult Ring-Billed Gulls and the rest were mostly winter adult and a few subadult Herring Gulls. [...] An adult gull in between the size of adjacent Ring-billed and Herring Gulls. It was noticeable larger than the Ring-bills; not too much smaller than the Herrings. It differed from the Herrings in being a little less barrel chested and a little slimmer, more horizontal in posture. | The original documentation form event occurred for 45 minutes during two sessions.
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Iowa Ornithologists' Union | MS 166
|
34
|
36
|
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Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-11-13
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 13, 1993.
|
Pinkston, Randall, 1956-
|
Thayer's Gull
|
Red Rock Dam
|
Lake Red Rock dam, Marion County, Iowa
|
|
The documentation form by Randall Pinkston is the only one submitted and forms the basis of this record. Other observers include Jim Fuller. | Elimination of similar species: Compared with first-winter Herring Gull above. Pale Thayer's may be confused with same-aged Iceland Gull, but Iceland typically much paler than this individual. Iceland should also show pale, mottled tertials and tail which are concolor with the upperparts. This bird's tertials and tail were unpatterned (except at the edges of the tertials) and darker than the remainder of the upperparts. Iceland's folded primaries are paler than the remainder of the mantle, not darker as in this bird. Slaty-backed, Glaucous-winged, and Glaucous-winged X Western hybrid Gulls all larger, have more massive bills, less likely in Iowa. | The original documentation form event lasted from 10:15:00/10:40:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Spirit Lake, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-11-09
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Spirit Lake in Dickinson County, IA on November 9, 1997.
|
Schoenewe, Lee A.
|
Thayer's Gull
|
Spirit Lake
|
South Shore of Spirit Lake, Dickinson Co.
|
Natural lakeshore
|
The documentation form by Lee A. Schoenewe is the only one submitted and forms the basis of this record. Other observers include Eugene Armstrong, and Eloise Armstrong. | Elimination of similar species: Herring Gull - Lack of dark color in primaries + tail; Glaucous-size; Iceland - overall gray-brown tinge
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Lock and Dam 15 in Davenport, 1996
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1996-11-14
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Lock and Dam 15 in Davenport in Scott County, IA on November 14, 1996.
|
Fuller, James L
|
Thayer's Gull
|
Lock and Dam 15
|
Lock & Dam #15 of Mississippi River, Davenport (Scott County)
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. | Elimination of similar species: The amount of black and white in the outer primary tips (both upper and underwing) is much less than would be expected in Ring-billed or Herring. Ring-billed is smaller with a dark ring on bill of adult. Although a few Herrings have somewhat bright pink legs, most are a dull pink. An Iceland adult should have a lighter mantle and upperwing, and less gray (not black) on the outer primary tips. | The original documentation form event lasted from 13:50:00/14:15:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Black Hawk Lake, 1996
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1996-02-11
|
1996-02-13
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Black Hawk Lake in Sac County, IA on February 11, 1996.
|
Thelen, Ed
|
Thayer's Gull
|
Black Hawk Lake
|
Black Hawk Lake Sac County
|
Natural Lake - near open water from aerator
|
The documentation form by Ed Thelen is the only one submitted and forms the basis of this record. Other observers include Rob Thelen and Peter Ernzen. | Elimination of similar species: Herring Gull has dark lesser coverts and dark feathers under the wing tips. More distinct tail band + larger bill. | The original documentation form event lasted from 09:30:00/10:00:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull on the Mississippi River at Davenport, 1996
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1996-01-07
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull on the Mississippi River at Davenport in Scott County, IA on January 7, 1996.
|
Edwards, Chris
|
Thayer's Gull
|
Davenport
|
Mississippi River, Davenport, Scott Co.
|
River.
|
The documentation form by Chris Edwards is the only one submitted and forms the basis of this record. Other observers include Curt Nelson. | Elimination of similar species: Herring Gull has black or dark brown primary tips and secondaries on upperside, dark gray primary tips on underside, whitish head, larger bill. Iceland Gull has white primary tips. | The original documentation form event lasted from 13:45:00/15:00:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Lock and Dam 15, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-12-17
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Lock and Dam 15 in Scott County, IA on December 17, 1995.
|
Petersen, Peter C.
|
Thayer's Gull
|
Lock and Dam 15
|
Lock + Dam 15, seen from Iowa walking near Il. Shore mostly
|
Open river
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Walter Zuurdeeg, Mary Lou Petersen, and Kelly McKay. | Elimination of similar species: Herring Gull - heavier bill, very dark primary tips, no windows, tail darker with uneven white edge, secondaries dark from above, underwing much darker. Iceland Gull would show much lighter plumage overall, especially tail + primary tips. | The original documentation form event lasted from 12:05:00/12:10:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-01-01
|
1995-03-01
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Red Rock Dam in Marion County, IA on January 1, 1995.
|
Johnson, Ann
|
Thayer's Gull
|
Red Rock Dam
|
Red Rock Dam, Marion Co., IA
|
gravel bar below dam
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. | Elimination of similar species: Structure, darker mantle, dark eye, and gray primaries eliminate Herring Gull. Other gulls of intermediate size - Lesser Black-backed eliminated by relative gray of mantle, leg color, and primary color. California eliminated by leg color, primary color, and lack of black marking on bill. Iceland eliminated by dark mantle color | The original documentation form event lasted from 10:15:00/10:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Lock and Dam 14, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-01-03
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Lock and Dam 14 in Scott County, IA on January 3, 1995.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lock and Dam 14
|
Lock and Dam 14, Scott Co., IA
|
Mississippi River dam
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: I looked at many variable first-winter Herring Gulls today. All had more dark on wing tip and darker tail band. This bird was easy to pick out over and over again. | The original documentation form event lasted from 12:00:00/12:20:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Cone Marsh, 1983
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1983-02-27
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Cone Marsh in Louisa County, IA on February 27, 1983.
|
Newlon, Michael C.
|
Thayer's Gull
|
Cone Marsh Wildlife Management Area
|
NE side Cone Marsh Louisa Co IA
|
freshwater marsh with considerable open water
|
The documentation form by Michael Newlon is the only one submitted and forms the basis of this record. Other observers include Carol S. Newlon. | Elimination of similar species: proportions, uniformly pale primaries would rule out herring; size/build rules out imm. glaucous. Bill much less heavy than imm. glaucous-winged. Remaining question is whether this bird is (over) a Thayer's Gull or a Kumlien's gull, presently considered separate species but widely suspected of being conspecific. Thayer's is extremely variable, and the limits of its variability are not well known, especially for imm. plumages. [Dwight says of his series of ad. thayeri, 'no two are alike'. It seems probable that there is clinal variation from west to east (thayeri - kumliesi [sic] - nominate glaucoides) and even possible that thayeri interbreeds with argenlatus at the western end of its range.] In addition several plumage descriptions in the literature may be assigned to birds of [illegible] age. Be that as it may: L. glaucoides glaucoides is supposed to have pale warm-brown primaries as a 1-W & paler, nearly whitish areas as a 2-W (though photos in grant's [sic] book show one 2-W with pale-brown primaries concolor with coverts). L. glaucoides kumlieni (in Dwight's plates) is assigned v. pale primaries as a 1-W, with slightly darker outer webs; would look uniform pale grey at any distance. His 2-W has darker primaries, again with slightly darker outer webs [I suspect these assignments should be reversed.] L. thayeri in published description is supposed to have darker primaries still, though not so dark as those of imm. Herring gulls, and lacking contrast with mantle. However some west coast thayeri-type gulls are very pale - though their back color is grey-brown rather than the warmer pale tan of L. glaucoides. (It is possible that these are really kumlieni but little data exists.) It is the similarity of the Cone Marsh Bird to one I photographed in Cal. that convinced me to classify it as thayeri - though kumleni cannot be unequivocally ruled out | The original documentation form event lasted from 11:10:00/12:30:00.
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Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-24
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Red Rock Dam in Marion County, IA on December 24, 1993.
|
Johnson, Ann
|
Thayer's Gull
|
Red Rock Dam
|
Below Red Rock Dam, Marion County, Iowa
|
Open river with gravel bars
|
The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. Other observers include Raymond Cummins. | Elimination of similar species: Dark eye and head/bill structure eliminated Herring Gull. | The original documentation form event lasted from 11:20:00/11:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull at Redrock Dam, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-24
|
1994-01-14
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Redrock Dam in Marion County, IA on December 24, 1993.
|
Cummins, Raymond L.
|
Thayer's Gull
|
Red Rock Dam
|
Lake Redrock below dam, Marion Co.
|
Open water below spillway.
|
The documentation form by Ray Cummins is the only one submitted and forms the basis of this record. Other observers include Ann Johnson. | Elimination of similar species: see above. [...] I picked this bird out because of it's small size compared to the other Herring Gulls present (40). It was smaller than any of the Herring gulls present, but still much larger than any of the numerous Ring-billed gulls. The head appeared more rounded than the Herring gulls and the heavy brown streaking on the nape and neck was more extensive and darker than any Herring present. The bill w/a red gonys mark on the lower mandible was shorter and thinner w/less gonys than the Herrings. They eye iris was dark not yellowish as in all the Herrings present. | The original documentation form event lasted from 10:00:00/10:35:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Thayer's Gull southeast of Jolly Roger Marina at Coralville Reservoir, 1993
|
Field notes
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Birds--Identification Ornithology Rare birds
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1993-12-19
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N/A
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Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull southeast of Jolly Roger Marina at Coralville Reservoir in Johnson County, IA on December 19, 1993.
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Pinkston, Randall, 1956-
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Thayer's Gull
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Jolly Rogers Campground
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Coralville Reservoir (1/4 - 1/2 mile southeast of Jolly Roger Marina), Johnson County, Iowa
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The documentation form by Randall Pinkston is the only one submitted and forms the basis of this record. | Elimination of similar species: Contrasted with first-winter Herring Gull above. First-winter Iceland typically much paler, especially the uppersurface of the primaries which are paler than the rest of the mantle, and Iceland should show mottling in the tertials and tail band. I suppose I cannot exclude a heavily-pigmented 'Kumlien's' Gull or an Iceland-Thayer's intergrade as described in Kevin Zimmer's Birding article. Both species are apparently highly variable. | The original documentation form event lasted from 10:45:00/11:15:00.
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Iowa Ornithologists' Union | MS 166
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34
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35
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