Records Committee review for rare bird sighting for Black-headed Grosbeak at Marble Rock, 1983
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1983-05-09
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Marble Rock in Floyd County, IA on May 9, 1983. Includes a record review document with votes, a letter from Bruce Peterjohn to Tom Kent, a summary of the review, and a documentation form submitted to the committee.
|
Knoop, Pearl
|
Black-headed Grosbeak
|
Marble Rock
|
Floyd county, about a mile south of Marble Rock, along river
|
Narrow tree and shrubby area along the Shellrock. This type of habitat extends along the river on both sides. More bushy in some places than others. There are nearby cultivated fields and tree areas.
|
The documentation form by Pearl Knoop is the only one submitted and forms the basis of this record. | Elimination of similar species: female rose-breased [sic] grosbeak. | The original documentation form event lasted from 08:00:00/08:10:00.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
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Rich DeCoster letter to Thomas H. Kent regarding bird sightings, May 29, 1980
|
Correspondence Field notes
|
Bird watching Birdsongs Birds--Research Ornithology--Methodology
|
1980-05-29
|
N/A
|
Manuscript, graphic, and printed material
|
Field notes contributed by Rich DeCoster in a letter to Thomas H. Kent, May 29, 1980. This item was used as supporting documentation for the Iowa Ornithologists Union Quarterly field report of spring 1980.
|
DeCoster, R. J. (Richard Joseph)
|
Upland Sandpiper Eastern Bluebird Loggerhead Shrike Acadian Flycatcher Kentucky Warbler
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Johnson County Muscatine County Wildcat Den State Park
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|
|
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Iowa Ornithologists' Union | MS 166
|
19
|
3
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Dorothy A. Brunner letter to Thomas H. Kent regarding bird sightings, May 28, 1980
|
Correspondence Field notes
|
Bird watching Birds--Nests Birds--Research Accipitridae | Hawks and Eagles Ornithology--Methodology Hirundinidae | Swallows Turdidae | Thrushes Vireonidae | Vireos Parulidae | Warblers
|
1980-05-28
|
N/A
|
Manuscript, graphic, and printed material
|
Field notes contributed by Dorothy A. Brunner in a letter to Thomas H. Kent, May 28, 1980. This item was used as supporting documentation for the Iowa Ornithologists Union Quarterly field report of spring 1980.
|
Brunner, Dorothy A.
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Red-headed Woodpecker Bobolink Eastern Kingbird Red-eyed Vireo Black Tern Great Egret Green Heron
|
Clear Lake Nora Springs Shell Rock River
|
|
|
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Iowa Ornithologists' Union | MS 166
|
19
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3
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Tanya Bray letter to Thomas H. Kent regarding bird sightings, June 2, 1980
|
Correspondence Field notes
|
Bird watching Birds--Identification Birdsongs Birds--Research Ornithology--Methodology
|
1980-06-02
|
N/A
|
Manuscript, graphic, and printed material
|
Field notes contributed by Tanya Bray in a letter to Thomas H. Kent, June 2, 1980. The letter includes identification information on the sighting of a Marbled Godwit. This item was used as supporting documentation for the Iowa Ornithologists Union Quarterly field report of spring 1980.
|
Bray, Tanya
|
Marbled Godwit Barred Owl Long-billed Dowitcher Eastern Screech-Owl
|
Mills County Pottawattamie County Pacific Junction
|
|
|
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Iowa Ornithologists' Union | MS 166
|
19
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3
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Field notes contributed by Tanya Bray, spring 1980
|
Correspondence Field notes
|
Bird watching Birds--Counting Birds--Research Anseriformes | Ducks, Geese, and Swans Laridae | Gulls and Terns Accipitridae | Hawks and Eagles Ornithology--Methodology Scolopacidae | Sandpipers, Phalaropes, and allies Fringillidae | Finches Vireonidae | Vireos Parulidae | Warblers Weather
|
1980-03-01
|
1980-05-31
|
Manuscript, graphic, and printed material
|
List of birds and locations contributed by Tanya Bray with observers Don Bray, Sandra Kovanda and Babs Padelford. This item was used as supporting documentation for the Iowa Ornithologists Union Quarterly field report of spring 1980.
|
Bray, Tanya
|
Marbled Godwit Barred Owl Chuck-will's-widow Wilson's Phalarope Long-billed Dowitcher Hooded Merganser Lesser Yellowlegs Willet Snow Goose Greater White-fronted Goose Common Merganser Eastern Screech-Owl
|
Forneys Lake Lake Anita State Park Lake Manawa Pottawattamie County DeSoto National Wildlife Refuge
|
|
|
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Iowa Ornithologists' Union | MS 166
|
19
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3
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Gladys Black letter to Thomas H. Kent regarding bird sightings, March 17, 1980
|
Correspondence Field notes
|
Bird watching Birds--Identification Birds--Research Ornithology--Methodology
|
1980-03-17
|
N/A
|
Manuscript, graphic, and printed material
|
Field notes contributed by Gladys Black in a letter to Thomas H. Kent, March 17, 1980. This item was used as supporting documentation for the Iowa Ornithologists Union Quarterly field report of spring 1980.
|
Black, Gladys
|
Varied Thrush Mountain Bluebird Ruddy Turnstone Pileated Woodpecker
|
Adel Lake Red Rock Mason City Hampton
|
|
|
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Iowa Ornithologists' Union | MS 166
|
19
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3
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Woodward H. Brown letter to Peter C. Petersen regarding Aubudon field notes, December 9, 1964
|
Correspondence Field notes
|
Bird populations Bird watching Birds--Research Ornithology--Methodology Charadriiformes | Shore-birds, Gulls, and Auks
|
1964-12-09
|
N/A
|
Manuscript, graphic, and printed material
|
Audubon field notes were contributed by Woodward H. Brown in a letter to Peter C. Petersen. This item was used as supporting documentation for the Iowa Ornithologists’ Union Quarterly field report of fall 1964.
|
Brown, Woodward H.
|
Rough-legged Hawk Red-tailed Hawk
|
Iowa
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
17
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3
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Florence McCaughey letter regarding fall bird migration, November 25, 1964
|
Correspondence Field notes
|
Bird populations Bird watching Birds--Migration Birds--Research Ornithology--Methodology Parulidae | Warblers
|
1964-11-25
|
N/A
|
Manuscript, graphic, and printed material
|
The bird migration report was contributed by Florence McCaughey. She mentions the sightings of warblers, Mourning Doves, Killdeers, Bluebirds, and one adult Bald Eagle.This item was used as supporting documentation for the Iowa Ornithologists’ Union Quarterly field report of fall 1964.
|
McCaughey, Florence
|
Killdeer Bald Eagle Varied Thrush Eastern Bluebird Mourning Dove
|
Iowa
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
17
|
3
|
Pearl Knoop letter to Peter C. Petersen regarding nesting season, August 21, 1964
|
Correspondence Field notes
|
Bird watching Birds--Migration Birds--Nests Birds--Research Ornithology--Methodology
|
1964-08-21
|
N/A
|
Manuscript, graphic, and printed material
|
Report of nesting season in Marble Rock, Iowa was contributed by Pearl Knoop in a letter to Peter C. Petersen.This item was used as supporting documentation for the Iowa Ornithologists’ Union Quarterly field report of summer 1964.
|
Knoop, Pearl
|
Dickcissel Wood Duck Ovenbird Louisiana Waterthrush Canada Warbler Mourning Dove
|
Marble Rock
|
|
|
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Iowa Ornithologists' Union | MS 166
|
17
|
3
|
Eldon J. Bryant letter to Woodward H. Brown regarding spring migration, May 17, 1964
|
Correspondence Field notes
|
Bird populations Bird watching Birds--Migration Birds--Research Ornithology--Methodology
|
1964-05-17
|
N/A
|
Manuscript, graphic, and printed material
|
Spring migration report contributed by Eldon J. Bryant in a letter to Woodward H. Brown. This item was used as supporting documentation for the Iowa Ornithologists’ Union Quarterly field report of spring 1964.
|
Bryant, Eldon J.
|
Killdeer Rough-legged Hawk Bobolink Gray Partridge Chipping Sparrow Common Pheasant
|
Iowa
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
17
|
3
|
Pearl Knoop letter to Peter C. Petersen regarding bird sightings, June 10, 1964
|
Correspondence Field notes
|
Bird populations Bird watching Birds--Migration Birds--Research Ornithology--Methodology
|
1964-06-10
|
N/A
|
Manuscript, graphic, and printed material
|
Bird sightings near Marble Rock, Iowa contributed by Pearl Knoop in a letter to Peter C. Petersen, Jr. This item was used as supporting documentation for the Iowa Ornithologists’ Union Quarterly field report of spring 1964.
|
Knoop, Pearl
|
Ferruginous Hawk Red-breasted Merganser American Pipit Common Loon Golden Eagle Great Egret
|
Marble Rock
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
17
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3
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Records Committee review for rare bird sighting for Black-headed Grosbeak at Woodpecker Marsh, 1999
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1999-09-07
|
2000-11-28
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Woodpecker Marsh in Wayne County, IA on September 7, 1999. Includes a record review document with votes, two letters from Charlotte Scott to Thomas Kent, and a letter from Thomas Kent to Charlotte Scott.
|
Scott, Charlotte
|
Black-headed Grosbeak
|
Woodpecker Marsh
|
on a country road near Woodpecker Marsh
|
|
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
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Records Committee review for rare bird sighting for Black-headed Grosbeak at Warren County Conservation Board Headquarters, 1996
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1996-05-12
|
2000-11-22
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Conservation Board Headquarters in Warren County, IA on May 12, 1996. Includes a record review document with votes, a letter from Ken Brock to Tom Kent and a documentation form submitted to the committee.
|
Sinclair, Jim
|
Black-headed Grosbeak
|
Lake Ahquabi State Park
|
Warrren Co. Conservation Board Headquarters
|
small deciduous trees
|
The documentation form by Jim Sinclair is the only one submitted and forms the basis of this record. Another observer was David Youngblut. | Elimination of similar species: Several [female symbol] Rose-breasted Grosbeaks were present for comparison. | The original documentation form event lasted from 06:45:00/07:00:00.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
|
Records Committee review for rare bird sighting of Western Sandpiper at Big Creek Lake, 1988
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-10-09
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for a Western Sandpiper at Big Creek Lake in Polk County, IA on October 9, 1988. Includes a record review document with votes, correspondence about the sighting by Guy McCaskie, Kim Eckert, and Bruce Peterjohn, and a documentation form submitted to the committee.
|
Johnson, Ann
|
Western Sandpiper
|
Big Creek Lake
|
Big Creek Wildlife Area, Polk Co., IA
|
Mudflats from low water on freshwater lake
|
The documentation form by Ann Johnson is only one submitted and forms the basis of this record. Other observers include Mike Thomas. | Elimination of similar species: Although I understand the difficulty in identification of fall western sandpipers, the Baird's and white-rumped were eliminated because of wing length. The least sandpiper was eliminated by leg color and bill shape/size. The most difficult elimination was that of the semipalmateds, especially since other semipals were present in the area. After careful observation and comparison, however, the prototypical western sandpiper bill was too obvious to make the bird into a semipalmated. The bill was enough longer and had an obvious droop. The others in the area had varying bill sizes but none had the general shape of this bird. Consequently, I believe this was a late date western sandpiper. | The original documentation form event lasted from approximately 15:00:00/15:10:00.
|
Iowa Ornithologists' Union | MS 166
|
10
|
3
|
Records Committee review for rare bird sighting for Black-headed Grosbeak at Elkhart, 1982
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1982-11-23
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Elkhart in Polk County, IA on November 23, 1982. Includes a record review document with votes, a letter from Bruce Peterjohn to Tom Kent, a summary of the review, and a documentation form submitted to the committee.
|
Mosman, Dean
|
Black-headed Grosbeak
|
Elkhart
|
2 M.E. Elkhart, IA
|
in wooded area
|
The documentation form by Darwin (Dean) Mosman is the only one submitted and forms the basis of this record. Other observers include Mike Mosman and Diane Mosman. | Elimination of similar species: Female Rose-breasted Grosbeak only species close to same appearance. No voice heard, behavior and habitat the same. Color and streaking only difference. | The original documentation form event lasted from 07:15:00/07:30:00.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
|
Records Committee review for rare bird sighting for Black-headed Grosbeak at Decorah, 1982
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1982-07-29
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Decorah in Winneshiek County, IA on July 29, 1982. Includes a record review document with votes, a letter from Bruce Peterjohn to Tom Kent, a summary of the review, and a letter from Jeri McMahon to Tom Kent.
|
McMahon, Jeri
|
Black-headed Grosbeak
|
Decorah
|
Trout River, near Decorah
|
|
A letter from Jeri McMahon to Tom Kent forms the basis of this record. | Elimination of similar species: The female rose-breasted grosbeak, plus juveniles, were also present that day, so I could compare the 2 species very well. It was not an im. male rose-breasted, although I saw several of those.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
|
Records Committee review for rare bird sighting for Black-headed Grosbeak at Little Swan Lake, 1982
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1982-07-14
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Little Swan Lake in Dickinson County, IA on July 14, 1982. Includes a record review document with votes, a summary of the review, a letter from Bruce Peterjohn to Tom Kent, and a documentation form submitted to the committee.
|
Harr, Douglas C.
|
Black-headed Grosbeak
|
Christopherson Slough / Little Swan Lake Wildlife Management Area
|
Woods, N. edge Little Swan Lake, Dickinson Co., Iowa (near Superior)
|
General: woodlands near lakeshore. Specific: bare branch understory of plum thicket (deep shade), at edge of planting of 25 ft. Austrian pines and black walnut trees.
|
The documentation form by Douglas C. Harr is the earliest and the one that forms the basis of this record. | Elimination of similar species: Rose-breasted grosbeak (female)--little or no yellow-tan color to breast & more heavily spotted or streaked. Blue Grosbeak (female)--a more uniform, unstreaked brown or tan. | The original documentation form event lasted from 13:22:00/13:23:00.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
|
Records Committee review for rare bird sighting for Black-headed Grosbeak at Rush Lake, 1982
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1982-05-20
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Rush Lake in Palo Alto County, IA on May 20, 1982. Includes a record review document with votes, a summary of the review, a letter from Ann Sernett to Thomas Kent, and a documentation form submitted to the committee.
|
Harms, Ronald
|
Black-headed Grosbeak
|
Rush Lake
|
South side Rush Lake, Palo Alto Co. and Mable [sic] Grous grove, Pocahontas Co.
|
Open woods
|
The documentation form by Ronald Harms is the only one submitted and forms the basis of this record. Other observers were Ann Luther, Mabel Grous, Ken Sernett and Ann Sernett. | Elimination of similar species: there were many [female symbol] Rose-brested [sic] around to compare.
|
Iowa Ornithologists' Union | MS 166
|
14
|
3
|
Records Committee review for rare bird sighting for Black-headed Grosbeak at Amana Woods, 1982
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1982-05-10
|
1993-09-01
|
Rare birds documentation form
|
Records Committee review for a Black-headed Grosbeak at Amana Woods in Iowa County, IA on May 10, 1982. Includes a record review document with votes, a letter from Bruce Peterjohn to Tom Kent, and two documentation forms submitted to the committee.
|
Silcock, W. Ross
|
Black-headed Grosbeak
|
Amana Woods
|
Amana Woods
|
Deciduous woods. Trail through woods along ridge.
|
The documentation form by W. Ross Silcock is the earliest and the one that forms the basis of this record. Another documentation form by Thomas Kent was submitted later. Other observers include Tom Staudt and Carl Bendorf. | The original documentation form event lasted from 18:30:00/18:32:00.
|
Iowa Ornithologists' Union | MS 166
|
14
|
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 Coralville Dam, 1981
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-12-06
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at Coralville Dam in Johnson County, IA on December 6, 1981. Includes a record review document with votes, correspondence and commentary about the sighting, field notes, and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Coralville Dam
|
Coralville Res. Dam, Johnson Co., Iowa
|
Reservoir just above dam on ice
|
The documentation form by Thomas H. Kent as dictated to Carl Bendorf is the only one submitted and forms the basis of this record. Another observer was Carl Bendorf. | Elimination of similar species: imm. Herring Gull. The second year Herring has a light bill with black tip and more contrasting black and white pattern to wings and tail. The first year Herring is much darker, has a more bulbous, hooked bill, and lacks the definitewhite [sic] window in flight. | The original documentation form event lasted from 08:15:00/08:30:00.
|
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 Coralville Dam, 1981
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-11-08
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for three Thayer's Gulls at Coralville Dam in Johnson County, IA on November 8, 1981. Includes a record review document with votes, correspondence and commentary about the sighting, summary of the review, and a documentation form submitted to the committee.
|
Moore, Francis L.
|
Thayer's Gull
|
Coralville Dam
|
Coralville Reservoir
|
Open wate [sic] near small sandy beach near the Dam area, Johnson County
|
The documentation form by Francis L. Moore is the only one submitted and forms the basis of this record. Other observers include Russell Hays, Tom Kent, Tom Shires, Tom Staudt, and many unidentified other observers. | Elimination of similar species: Ring-billed Gull and Herring Gull, see above. The Ring-billed Gulls were seen in direct contrast to these three birds and were definitely much smaller birds. The Herring Gulls (first year birds) that I have seen have more of a contrast between the rump and back and upper wing surfaces and none that I remember showed the whitish trailing edge on the tail. [...] The three birds seen were about the size of Herring Gulls in typical first year plumage. They were obviously large gulls of the genus Larus with a noticeably larger size than the Ring-billed Gulls and one Bonaparte's Gull that were next to the three larger birds. [...] There were no Herring Gulls nearby with which to make a comparison of size and coloration. The bills of all three gulls were black did not seem as heavy or bulky as the bill of a Herring Gull. | The original documentation form event lasted from 08:10:00/09:30:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Coralville Dam, 1981
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-11-07
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for two Thayer's Gulls at Coralville Dam in Johnson County, IA on November 7, 1981. Includes a record review document with votes, correspondence and commentary about the sighting, and a documentation form submitted to the committee.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Thayer's Gull
|
Coralville Dam
|
Coralville Res. Dam, west overlook, Johnson Co. Iowa
|
Reservoir, just above dam, in water and on swimming beach
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Carl Bendorf, Mike Newlon, and many unidentified other observers. | Elimination of similar species: Photographs taken at the first encounter with a Celestron 750 mm lens demonstrate the size difference, the bill and head shape difference, the lighter overall color, and the window in the wing. An adult Herring was in the photo with the Thayer's on 7 Nov and imm Herring were photographed on 10 Nov for comparison. | The original documentation form event lasted from 09:25:00/09:50:00 and 11:00:00/11:20:00 on November 7, 1981 and 07:30:00/08:30:00 on November 8, 1981.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull at Lake Manawa, 1981
|
Administrative records Clippings (information artifacts) Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1981-03-19
|
1993-08-26
|
Rare birds documentation form
|
Records Committee review for two Thayer's Gulls at Lake Manawa in Pottawattamie County, IA on March 19, 1981. Includes a record review document with votes, correspondence and comments about the sighting, an article in Iowa Bird Life, and four documentation forms submitted to the committee.
|
Silcock, W. Ross
|
Thayer's Gull
|
Lake Manawa
|
Lake Manawa, Pottawattamie County, Iowa.
|
|
The documentation form by Ross Silcock is the earliest and the one that forms the basis of this record. Other documentation forms by Thomas H. Kent, Peter C. Petersen, and Robert K. Myers were submitted later. Other observers include Tom Shires, James Kovanda, Sandra Kovanda, Tanya Bray, Babs Padelford, Loren Padelford, B.J. Rose, and four unidentified other observers. | Elimination of similar species: The above description separates by direct comparison first-year Thayer's and Herring Gulls, the most similar species present. Thayer's may be confused in first year plumage with Kumlien's form of Iceland Gull, but the Thayer's had primaries slightly darker than the mantle (from above), whereas the opposite occurs in Iceland Gull (Lehman). Lehman also notes that some first-year Western Gulls may show translucent primaries from below in certain light, but these observations took place in excellent light at fairly close range. | The original documentation form event lasted from approximately 09:30:00/11:00:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|