Records Committee review for rare bird sighting for Pacific Loon at Glendale Cemetery, 1948
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1948-12-08
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Red-throated Loon at Polk County, IA in 1948. Includes a record review document with votes, the original sighting record found in the publication Pacific Loon in Polk County Iowa in Iowa Bird Life by Jack Musgrove, and referenced by another publication.
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Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Glendale Cemetery
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Brown Pelican at Twin Lake, 1963
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1963-09-14
|
1993-09-07
|
Manuscript, graphic, and printed material
|
Records Committee review for a Brown Pelican at Twin Lake in Calhoun County, IA on September 14, 1963. Includes a record review document with votes and the original sighting record found in the publication Iowa Bird Life 33:86 seen by Mrs. George Wright.
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Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Twin Lakes
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
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11
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Records Committee review for rare bird sighting for Brown Pelican at Brenton Slough in 1959
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Water birds
|
1959-04-26
|
1993-09-07
|
Manuscript, graphic, and printed material
|
Records Committee review for a Brown Pelican at Brenton Slough in Polk County, IA on April 26, 1959. Includes a record review document with votes and the original sighting record found in the publication Brown Pelican record near Des Moines in Iowa Bird Life 30:47 seen by Helen and Harold Peasley.
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Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Brenton Slough
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
11
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Records Committee review for rare bird sighting for Brown Pelican at Boone in 1900
|
Administrative records Clippings (information artifacts) Correspondence Field notes Reports
|
Birds--Identification Rare birds
|
1900-07-01
|
1993-09-07
|
Manuscript, graphic, and printed material
|
Records Committee review for a Brown Pelican near Boone in Boone County, IA in July 1900. Includes a record review document with votes, a letter from David A Newhouse to IOU Records Committee, the original sighting record found in the publication A Southern bird in central Iowa by C.F. Henning seen by Fritcher brothers, and referenced in three other publications.
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Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Boone
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
11
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Records Committee review for rare bird sighting for Brown Pelican at Council Bluffs in 1819
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Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Trapping
|
1819-01-01
|
1993-09-07
|
Manuscript, graphic, and printed material
|
Records Committee review for a Brown Pelican at Council Bluffs in Pottawattamie County, IA in 1819. Includes a record review document with votes, the original sighting record found in the publication The Birds of Iowa in the Proceedings of the Davenport Academy of Sciences 11:125-417 by Rudolph Martin Anderson, and referenced in two other publications.
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Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Council Bluffs
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
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11
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Records Committee review for rare bird sighting for Northern Gannet at Sioux City, 1980
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Administrative records Field notes
|
Birds--Identification Rare birds
|
1980-04-04
|
1993-09-01
|
Manuscript, graphic, and printed material
|
Records Committee review for Northern Gannet at Sioux City in Woodbury County, IA on April 4, 1980. Includes a record review document with votes.
|
Iowa Ornithologists' Union Records Committee
|
Northern Gannet
|
Sioux City
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
10
|
Records Committee review for rare bird sighting for Pacific Loon at Saylorville Reservoir, 1996
|
Administrative records Field notes Tables (documents)
|
Birds--Identification Ornithology--Technique Rare birds
|
1996-11-05
|
2000-11-22
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Saylorville Reservoir in Polk County, IA on November 5, 1996. Includes a record review document with votes and the original sighting record found in the Iowa Field Reports by Stephen J. Dinsmore.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Saylorville Lake
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
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Records Committee review for rare bird sighting for Pacific Loon at Maffit Lake, 1972
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Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1972-05-06
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for two Pacific Loons at Maffit Lake in Polk County, IA on May 6, 1972. Includes a record review document with votes, commentary by the IOU Records Committee on the bird sighting, the original sighting record found in the publication Field Reports in Iowa Bird Life 42:37 seen by Woodward H. Brown and D. Mooney.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Dale Maffitt Reservoir
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
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Records Committee review for rare bird sighting for Pacific Loon at Des Moines Reservoir, 1970
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1970-11-11
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Des Moines Reservoir in Polk County, IA on November 11, 1970. Includes a record review document with votes, commentary by the IOU Records Committee on the sighting, the original sighting record found in the publication American Birds 25:65 seen by Woodward H. Brown.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Dale Maffitt Reservoir
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Pacific Loon at Des Moines Impounding Reservoir, 1965
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1965-10-22
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Des Moines Impounding Reservoir in Polk County, IA on October 22, 1965. Includes a record review document with votes, commentary by the IOU Records Committee on the bird sighting, and the original sighting record found in the publication An Annotated List of the Birds of Iowa by Woodward H. Brown seen by A.C. Berkowitz.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Dale Maffitt Reservoir
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Pacific Loon at Des Moines Impounding Reservoir, 1964
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1964-06-06
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Des Moines Impounding Reservoir in Polk County, IA on June 6, 1964. Includes a record review document with votes, comments by the IOU Records Committee on bird sightings, the original sighting record found in the publication Audubon Field Notes 18:1511 by Woodward H. Brown, and referenced by two other publications.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Dale Maffitt Reservoir
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Pacific Loon at Scott County, 1951
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1951-01-01
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Scott County, IA around 1951. Includes a record review document with votes, comments by the IOU Records Committee on the bird sighting, the original sighting record found in the publication Iowa Bird Life by A. Lang Baily seen by A.W. Housman, and reference by a later publication.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Scott County
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Pacific Loon at Des Moines Water Works, 1948
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1948-12-11
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for a Pacific Loon at Des Moines Water Works in Polk County, IA on December 11, 1948. Includes a record review document with votes, comments by the IOU Records Committee on the original bird sighting, the original sighting record found in the publication Pacific Loon and other water birds at Des Moines Impounding Reservoir in Iowa Bird Life written and seen by A.C. Berkowitz, and referenced by a later publication.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Waterworks Park
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting for Pacific Loon at Beaver Creek, 1902
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1902-12-01
|
1994-02-03
|
Manuscript, graphic, and printed material
|
Records Committee review for two Pacific Loon at Beaver Creek in Polk County, IA, in December, 1902. Includes a record review document with votes, comments by the IOU Records Committee on the sighting, the original sighting record found in the publication Birds of Polk County, Iowa, by Philip A. DuMont and seen by Lester P. Fagan.
|
Iowa Ornithologists' Union Records Committee
|
Pacific Loon
|
Beaver Creek
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
Records Committee review for rare bird sighting of California Gull at Cherry Glen Recreation Area at Saylorville Reservoir, 1997
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1997-12-09
|
2000-11-24
|
Rare birds documentation form
|
Records Committee review for a California Gull at Cherry Glen Recreation Area at Saylorville Reservoir in Polk County, IA on December 9, 1997. Includes a record review document with votes and a documentation form submitted to the committee.
|
Overton, Michael D.
|
California Gull
|
Cherry Glen Recreation Area
|
Polk co., Saylorville Reservoir, Cherry Glen Recreation Area
|
On ice along lakeshore of large manmade lake in mixed hardwood forest agricultural cropland.
|
The documentation form by Michael D. Overton is the only one submitted and forms the basis of this record. Other observers include Eugene Armstrong and Eloise Armstrong. | Elimination of similar species: Ring-billed Gull, Herring Gull: Immatures of both species were present so direct comparisons were possible. Bill color, shape, and size reletive [sic] to head. Tail and rump color. Wing color and pattern especially mantle, greater coverts, and secondaries. | The original documentation form event lasted from 10:20:00/10:55:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
1
|
Records Committee review for rare bird sighting of Thayer's Gull at Cottonwood Recreation Area near Saylorville Dam, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-03
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review of a Thayer's Gull at Cottonwood Recreation Area near Saylorville Dam in Polk County, IA on December 3, 1986. Includes a record review document with votes and a documentation form submitted to the committee.
|
Petersen, Peter C.
|
Thayer's Gull
|
Cottonwood Recreation Area
|
Cottonwood Rec. Area below Saylorville Dam. Polk Co
|
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Beth Proescholdt, Mark Proescholdt, Steve Dinsmore, Gil Sandvick, and unidentified other observers. | Elimination of similar species: [...] Birds call not distinguishable from Ring-billed Gulls feeding with it. [...] Herring Gull eliminated by lack of sharp contrast between primaries + remainder of mantle + back and whitish undersides of primaries. | The original documentation form event lasted from 10:02:00/10:03:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull near Saylorville Reservoir Dam and Oak Grove Beach, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-23
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for seven or more Thayer's Gulls near Saylorville Reservoir Dam and Oak Grove Beach in Polk County, IA on November 23, 1986. Includes a record review document with votes, a summary of the review, and seven documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam Oak Grove Recreation Area
|
Saylorville Reservoir, Polk Co.(Oak Grove Beach and near dam)
|
seen resting on beach and flying over water near dam
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Steve Dinsmore were submitted. Other observers include Paul Martsching, Bob Myers, Beth Proescholdt, Mark Proescholdt, and many unidentified other observers. | Elimination of similar species: The darker body plumage and dark tail band eliminate Iceland Gull (Kumlien's form). The smaller size, smaller, more delicate bill, more rounded head, silvery white underwing pattern, more uniform body color, and more uniform upperwing pattern eliminate first winter Herring Gull. | The original documentation form event occurred at various times.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of Thayer's Gull near Oak Grove Beach and Saylorville Reservoir Dam, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-23
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull near Oak Grove Beach and Saylorville Reservoir Dam in Polk County, IA on November 23, 1986. Includes a record review document with votes, a summary of the review, and ten documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam Oak Grove Recreation Area
|
Saylorville Reservoir, Polk Co. (Oak Grove Beach and near dam)
|
seen resting on beach and flying over water near dam
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Bob Myers, Mark Proescholdt, Beth Proescholdt, Thomas H. Kent, Jim Fuller, Francis L. Moore, Robert Cecil, and Paul Martsching were submitted. | Elimination of similar species: The darker body plumage and dark tail band eliminate Iceland Gull (Kumlien's form). The smaller size, smaller, more delicate bill, more rounded head, silvery white underwing pattern, more uniform body color, and more uniform upperwing pattern eliminate first winter Herring Gull. | The original documentation form event lasted from 10:50:00/11:55:00 and 15:50:00/16:05:00 on November 23, 1986 and 14:50:00/15:35:00 on November 24, 1986.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
Records Committee review for rare bird sighting of 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 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.
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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.
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Iowa Ornithologists' Union | MS 166
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