| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9f18sh7b |
| Type |
Image, Text |
| Description |
Records Committee review of a Laughing Gull at Oak Grove Beach at Saylorville Reservoir in Polk County, IA on April 13, 1990. Includes a record review document with votes, a photocopy of a photo, and a documentation form submitted to the committee. |
| Related Genres |
Administrative records Field notes Photographs |
| Sort Date |
1990-04-13 - 1993-07-17 |
| People / Organizations |
|
| Time |
10:48 AM |
| Rights |
This complex item has mixed rights protection. Portions in which Iowa State University is the copyright holder are made available for non-commercial use, including sharing and adapting the work. No permission is required for non-commercial use to these portions so long as attribution is provided. All other uses of these portions, including commercial, require permission from the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). (CC BY-NC 4.0 International). Portions in which Iowa State University is not the copyright holder are believed to be under copyright, but either (a) no rights-holder(s) have been identified or (b) one or more rights-holder(s) have been identified but none have been located. If you have any information that can contribute to identifying or locating the rights-holder(s) please notify the Iowa State University Library Digital Initiatives Program (digital@iastate.edu). (Rightsstatements.org InC-RUU 1.0). The original object is available at the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). |
| Data Access Rights |
http://vertnet.org/resources/norms.html |
| Data License |
http://creativecommons.org/publicdomain/zero/1.0 |
| Collection |
Iowa Ornithologists' Union | MS 166 |
| Box |
10 |
| Folder |
18 |
| 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 |
Laughing Gull |
| Locations |
Oak Grove Recreation Area |
| Map |
|
| Verbatim Locality |
Oak Grove Beach, Saylorville Reservoir, Polk Co., IA |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
|
| Extent |
4 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
The documentation form by Stephen J. Dinsmore is the only one submitted and forms the basis of this record. Other observers include Eugene Armstrong and Eloise Armstrong. | Elimination of similar species: On the basis of the dark hood, size, and dark gray mantle, all gulls except for Laughing and Franklin's gulls can be removed from consideration. I will admit that I was skeptical that a Laughing Gull could show up in Iowa on such an early spring date; most interior records are from May-June. But, given the evidence, I am convinced that this bird was indeed a Laughing Gull. The size of this bird, nearly that of a ring-billed gull, favors Laughing Gull. The bill shape and size, length of the legs, wing pattern, and extent of the eye crescents also favor Laughing Gull. An adult Franklin's Gull can be eliminated by the lack of a white bar separating the gray inner wing from the black wingtip. One year-old Franklin's Gulls, however, may show a wing pattern like that of this bird. But, according to Kaufman (1990), such a Franklin's Gull should show some white flecks on the hood, and would be most likely encountered in late spring and summer. | The original documentation form event lasted from 10:48:00/11:34:00 and 12:26:00/13:20:00. |
| Occurrence Status |
present |
| Field Number |
1990-12 |
| Event Remarks |
Viewing Conditions: Viewing conditions were excellent with an overcast sky. Estimated viewing distance was as close as 50 feet. I used Bausch and Lomb 7x35 binoculars and 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. | Kaufmann K. Kaufman field guide to advanced birding. Peterson Field Guide Series. New York: Houghton Mifflin Harcourt. |
| Date Digital |
24 May 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed/flatbed |
