| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9sb3x14k |
| Type |
Text |
| Description |
Rare bird documentation form for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 13, 1993. |
| Related Genres |
Field notes |
| Sort Date |
1993-11-13 |
| People / Organizations |
|
| Time |
10:15 AM |
| Rights |
This Item is protected by copyright and/or related rights. However, for this Item, 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 |
34 |
| Folder |
35 |
| Contributing Institution |
Iowa State University Library Special Collections and University Archives |
| Creator / Author |
Pinkston, Randall, 1956- |
| Contributors |
Fuller, James L |
| Topics |
Birds--Identification Ornithology Rare birds |
| Birds |
Thayer's Gull |
| Locations |
Red Rock Dam |
| Map |
|
| Verbatim Locality |
Lake Red Rock dam, Marion County, Iowa |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
|
| Extent |
2 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
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. |
| Occurrence Status |
present |
| Field Number |
|
| Event Remarks |
Viewing Conditions: Overcast, cold north wind; observed at approx. 50 meters with Zeiss 10x40 binocular and Bausch and Lomb 30x telescope. |
| Supporting Documentation |
Kaufmann K. Advanced birding. Boston: Houghton Mifflin Harcourt. |
| Date Digital |
15 Dec 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed |
