UID
Digital Object Type Rare birds documentation form
Content DM Link https://n2t.net/ark:/87292/w9xd0r12b
Type Text
Description Records Committee review for one to three Thayer's Gulls north of Jester Park at Saylorville Reservoir in Polk County, IA on November 30, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
Related Genres Administrative records Field notes
Sort Date 1988-11-30 - 1993-08-04
People / Organizations
Time 1:38 PM
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Data License http://creativecommons.org/publicdomain/zero/1.0
Collection Iowa Ornithologists' Union | MS 166
Box 11
Folder 3
Contributing Institution Iowa State University Library Special Collections and University Archives
Creator / Author Dinsmore, Stephen J.
Contributors Iowa Ornithologists' Union Records Committee
Topics Bird watching Ornithology Ornithology--Societies, etc
Birds Thayer's Gull
Locations Jester Park
Map
Verbatim Locality Saylorville Reservoir, Polk Co.-north of Jester Park
Location Remarks The documentation forms do not include georeferences
Habitat feeding in river channel with thousands of other gulls
Extent 2 pages
Language(s) eng
Bibliographic Citation
Information Withheld
Individual Count 1
Occurrence Remarks The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include many unidentified other observers. | Elimination of similar species: The bill and leg color and size eliminates all gulls except Herring, Thayer's, and Iceland gulls. The uniform dark color of the wings, lack of a lighter "window" on the inner primaries, and the silvery color of the underside of the flight feathers eliminates 1st-winter Herring and Iceland gulls. | The original documentation form event lasted from 13:38:00/14:55:00 on November 30, 1988.
Occurrence Status present
Field Number 1988-37
Event Remarks Viewing Conditions: Viewing conditions were good with the sun behind me. Estimated viewing distance was 400 yards. I used a Buschnell 20-45x spotting scope.
Supporting Documentation National Geographic Society. National geographic field guide to the birds of North America. Washington D.C.: National Geographic Society.
Date Digital 30 May 2017
File Type image/jpeg
Hardware / Software Epson - sheet feed