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Rare bird documentation form for Thayer's Gull southeast of Jolly Roger Marina at Coralville Reservoir, 1993
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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
|
Jolly Rogers Campground
|
Coralville Reservoir (1/4 - 1/2 mile southeast of Jolly Roger Marina), Johnson County, Iowa
|
|
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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35
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Rare bird documentation form for Thayer's Gull south of Muscatine, 1997
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Field notes
|
Birds--Identification Ornithology Rare birds
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1997-12-28
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N/A
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Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull south of Muscatine in Muscatine County, IA on December 28, 1997.
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McKay, Kelly
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Thayer's Gull
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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.
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Spirit Lake, 1997
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-11-09
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N/A
|
Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Spirit Lake in Dickinson County, IA on November 9, 1997.
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Schoenewe, Lee A.
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Thayer's Gull
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Spirit Lake
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South Shore of Spirit Lake, Dickinson Co.
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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
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Lock and Dam 15 in Davenport, 1996
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Field notes
|
Birds--Identification Ornithology Rare birds
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1996-11-14
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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.
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Fuller, James L
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Thayer's Gull
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Lock and Dam 15
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Lock & Dam #15 of Mississippi River, Davenport (Scott County)
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|
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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Christmas Bird Count 1996
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Field notes
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Birds--Identification Ornithology Rare birds
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1996-12-22
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1996-12-23
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Manuscript, graphic, and printed material
|
Field notes from a Christmas Bird Count with details on the sighting of Thayer's Gull's at Lock and Dam 13, 14, 15 near Davenport and Clinton on December 22 and 23, 1996. Includes observers Pete Petersen, Walter Zuurdeeg and others.
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McKay, Kelly
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Thayer's Gull Chukar Greater Scaup
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Clinton Davenport Lock and Dam 14 Lock and Dam 15 Lock and Dam 13
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Black Hawk Lake, 1996
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Field notes
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Birds--Identification Ornithology Rare birds
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1996-02-11
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1996-02-13
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Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Black Hawk Lake in Sac County, IA on February 11, 1996.
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Thelen, Ed
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Thayer's Gull
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Black Hawk Lake
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Black Hawk Lake Sac County
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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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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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.
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Edwards, Chris
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Thayer's Gull
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Davenport
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Mississippi River, Davenport, Scott Co.
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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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Lock and Dam 15, 1995
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Field notes
|
Birds--Identification Ornithology Rare birds
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1995-12-17
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N/A
|
Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Lock and Dam 15 in Scott County, IA on December 17, 1995.
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Petersen, Peter C.
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Thayer's Gull
|
Lock and Dam 15
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Lock + Dam 15, seen from Iowa walking near Il. Shore mostly
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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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1995
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Field notes
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Birds--Identification Ornithology Rare birds
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1995-01-01
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1995-03-01
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Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Red Rock Dam in Marion County, IA on January 1, 1995.
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Johnson, Ann
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Thayer's Gull
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Red Rock Dam
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Red Rock Dam, Marion Co., IA
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gravel bar below dam
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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: 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.
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Lock and Dam 14, 1995
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Field notes
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Birds--Identification Ornithology Rare birds
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1995-01-03
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N/A
|
Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Lock and Dam 14 in Scott County, IA on January 3, 1995.
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Kent, Thomas H. (Thomas Hugh), 1934-
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Thayer's Gull
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Lock and Dam 14
|
Lock and Dam 14, Scott Co., IA
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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.
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Cone Marsh, 1983
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Field notes
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Birds--Identification Ornithology Rare birds
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1983-02-27
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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 at Cone Marsh in Louisa County, IA on February 27, 1983.
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Newlon, Michael C.
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Thayer's Gull
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Cone Marsh Wildlife Management Area
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NE side Cone Marsh Louisa Co IA
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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
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35
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Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1993
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Field notes
|
Birds--Identification Ornithology Rare birds
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1993-12-24
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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
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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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Redrock Dam, 1993
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-24
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1994-01-14
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Rare birds documentation form
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Rare bird documentation form for a Thayer's Gull at Redrock Dam in Marion County, IA on December 24, 1993.
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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.
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Island View at Rathbun Reservoir, 1986
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-12-20
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1986-12-23
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Rare birds documentation form
|
Rare bird documentation form for three Thayer's Gulls at Island View Park at Rathbun Reservoir in Appanoose County, IA on December 20, 1986.
|
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 Stephen J. Dinsmore is the only one submitted and forms the basis of this record. Other observers include Ray Cummins. | 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.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Red Rock Dam, 1993
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Field notes
|
Birds--Identification Ornithology Rare birds
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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.
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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.
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Iowa Ornithologists' Union | MS 166
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35
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Documentation of an extraordinary bird sighting, Thayer's Gull, November 13, 1993
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Field notes
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Birds--Identification Ornithology Rare birds
|
1993-11-13
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1993-11-27
|
Manuscript, graphic, and printed material
|
Documentation supporting the sighting of a Thayer's Gull at Red Rock Reservoir in Marion County, IA contributed by Thomas H. Kent on November 13, 1993.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lake Red Rock
|
|
|
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Red Rock Reservoir, 1993
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-11-13
|
1993-11-16
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Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Red Rock Reservoir in Marion County, IA on November 13, 1993.
|
Cecil, Robert I.
|
Thayer's Gull
|
Lake Red Rock
|
Tailwaters, Red Rock Res.
|
Tailwaters/River
|
The documentation form by Bob Cecil is the only one submitted and forms the basis of this record. Other observers include Tom Kent and Dick Tetrault. | Elimination of similar species: 1st winter Herring Gull has a very dark secondary bar, often has lighter head, and generally has a much more 'contrastry' appearance involving darker and lighter shades of brown. Overall, the 1st winter Herring is darker brown. | The original documentation form event occurred in the afternoon.
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Iowa Ornithologists' Union | MS 166
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35
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Rare bird documentation form for Thayer's Gull at Iowa City, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
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1993-01-19
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Iowa City in Johnson County, IA on January 19, 1993.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Iowa City
|
Iowa City, Johnson Co., Iowa.
|
partially open Iowa 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: I distinguished this bird from Herring Gull based on smaller body size, smaller head and bill, shorter wing span, uniform light tan coloration, medium brown (not black) outer primaries, translucent primaries from below, and medium brown tail band. I distinguished it from Iceland Gull by the brown outer primaries, relatively more tan coloration, and medium brown tail band. | The original documentation form event lasted from 11:40:00/11:50:00.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Details for Accipiters during a Christmas Bird Count at Burlington, 1992
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Field notes
|
Birds--Identification Ornithology Rare birds
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1992-12-19
|
N/A
|
Manuscript, graphic, and printed material
|
Details for sightings of two Cooper's Hawks, Thayer's Gull and a Sharp-shinned Hawk at the Burlington area in Des Moines County, IA on December 19, 1992 by an unknown author.
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Iowa Ornithologists' Union
|
Cooper's Hawk Thayer's Gull Sharp-shinned Hawk
|
Burlington Sacred Heart Cemetery Burlington Municipal Airport
|
|
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Iowa Ornithologists' Union | MS 166
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34
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35
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Details for unusual bird sighting, 1992
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Field notes
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Birds--Identification Ornithology Rare birds
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1992-11-08
|
N/A
|
Manuscript, graphic, and printed material
|
Rare bird sighting for a Thayer's Gull by Jim Fuller at Red Rock Reservoir in Marion County, IA on November 8, 1992.
|
Fuller, James L
|
Thayer's Gull
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Red Rock Dam
|
|
|
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Iowa Ornithologists' Union | MS 166
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34
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35
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Documentation form for extraordinary bird sightings in Iowa, Thayer's Gull, February 7, 1992
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Field notes
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Birds--Identification Ornithology Rare birds
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1992-02-07
|
N/A
|
Manuscript, graphic, and printed material
|
Documentation form supporting the sighting of a Thayer's Gull at Lock and Dam 14 contributed by Bob Cecil on February 7, 1992.
|
Cecil, Robert I.
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Thayer's Gull
|
Lock and Dam 14
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|
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Lock and Dam 15 in Davenport, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
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1992-01-17
|
1992-01-19
|
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 January 17, 1992.
|
Cecil, Robert I.
|
Thayer's Gull
|
Lock and Dam 15
|
Lock and Dam 15, Davenport, Iowa. Rusty Pelican Restaurant
|
River
|
The documentation form by Bob Cecil is the only one submitted and forms the basis of this record. | Elimination of similar species: See above discussion. [...] The wingtip pattern is what caught my attention. There was much less darkening to the outer primaries than on accompanying gulls. [...] When viewed fro [sic] underneath, the wingtips of the subject bird were white to the tips, with the exception of very narrow black tips at the tips of the primaries. This was very different from the adult Herring/Ring-bills which had substantial black towards the end of the underwings. | The original documentation form event lasted from 10:30:00/10:45:00.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Lock + Dam 15, 1992
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-17
|
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 January 17, 1992.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Lock and Dam 15
|
Lock + Dam #15, Davenport, IA
|
Mississippi 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 and others. | Elimination of similar species: Herring Gull-see above. | The original documentation form event lasted from 15:30:00/15:35:00.
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Iowa Ornithologists' Union | MS 166
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34
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35
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Details for unusual bird sighting, 1992
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Field notes
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Birds--Identification Ornithology Rare birds
|
1992-01-09
|
1992-01-17
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Manuscript, graphic, and printed material
|
Rare bird sighting for a Thayer's Gull by Jim Fuller at Lock and Dam 15 near Davenport in Scott County, IA on January 9, 13, and 17, 1992.
|
Fuller, James L
|
Thayer's Gull
|
Lock and Dam 15
|
|
|
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Iowa Ornithologists' Union | MS 166
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34
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35
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Rare bird documentation form for Thayer's Gull at Lock and Dam 19, 1990
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Field notes
|
Birds--Identification Ornithology Rare birds
|
1990-11-06
|
1990-11-09
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Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull at Lock and Dam 19 in Keokuk in Lee County, IA on November 6, 1990.
|
Cecil, Robert I.
|
Thayer's Gull
|
Lock Number 19
|
Behind Lock and Dam 19 at Keokuk, Lee County, Iowa
|
River
|
The documentation form by Robert Cecil is the only one submitted and forms the basis of this record. | Elimination of similar species: Too small, to [sic] uniform in color for Herring. Slight darkening at wingtips eliminates Iceland. | The original documentation form event lasted from 07:45:00/08:00:00 and 13:30:00/13:40:00.
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Iowa Ornithologists' Union | MS 166
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34
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35
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