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
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
11
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Records Committee review for rare bird sighting for Little Blue Heron at Wapello Lake in 1933
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Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds
|
1933-07-25
|
1993-08-27
|
Manuscript, graphic, and printed material
|
Records Committee review for three Little Blue Herons at Wapello Lake in Davis County, IA on July 20, 1933. Includes a record review document with votes and the original sighting record found in the publication The American Egret and Little Blue Heron in Iowa during 1933 by Philiip A. DuMont seen by I.T. Bode.
|
Iowa Ornithologists' Union Records Committee
|
Little Blue Heron
|
Lake Wapello
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
17
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Records Committee review for rare bird sighting for Snowy Egret at Elk Lake in 1934
|
Administrative records Clippings (information artifacts) Correspondence Field notes
|
Birds--Identification Rare birds Zoological specimens
|
1934-07-24
|
1996-04-24
|
Manuscript, graphic, and printed material
|
Records Committee review for two Snowy Egrets at Elk Lake in Clay County, IA on July 24, 1934. Includes a record review document with votes, a request for reconsideration, a letter from Jim Dinsmore to Department of Animal Ecology in Iowa State University, the original sighting record found in the publication Little Blue Herons in Iowa in Iowa Bird Life 5:13 by Logan J. Bennett, and referenced in another publication.
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Iowa Ornithologists' Union Records Committee
|
Snowy Egret
|
Elk Lake
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
16
|
Records Committee review for rare bird sighting for Magnificent Frigatebird at Davenport in 1946
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Administrative records Clippings (information artifacts) Field notes
|
Birds--Behavior Birds--Identification Rare birds
|
1946-04-01
|
1993-09-01
|
Manuscript, graphic, and printed material
|
Records Committee review for a Magnificent Frigatebird at Davenport in Scott County, IA in 1946. Includes a record review document with votes, the original sighting record found in the publication Notes on the Bird Life in the Mississippi Valley in Proceedings of the Iowa Academy Sciences 56:343-345 by James Hodges.
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Iowa Ornithologists' Union Records Committee
|
Magnificent Frigatebird
|
Davenport
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
15
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Records Committee review for rare bird sighting for Magnificent Frigatebird at Burlington in 1904
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Hunting Taxidermy
|
1904-03-01
|
1994-01-28
|
Manuscript, graphic, and printed material
|
Records Committee review for a Magnificent Frigatebird at Burlington in Des Moines County, IA in the spring of 1904. Includes a record review document with votes, request for reconsideration, the original sighting record found in the publication A new bird for Illinois in Auk 27:75 by Henry K. Coale, and referenced in two other publications.
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Iowa Ornithologists' Union Records Committee
|
Magnificent Frigatebird
|
Burlington
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
15
|
Records Committee review for rare bird sighting for Magnificent Frigatebird at Burlington in 1903
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Hunting Zoological specimens
|
1903-08-01
|
1996-04-24
|
Manuscript, graphic, and printed material
|
Records Committee review for a Magnificent Frigatebird at Burlington in Des Moines County, IA in August 1903. Includes a record review document with votes, request for reconsideration of record, the original sighting record found in the publication Birds of Iowa by Rudolph Martin Anderson seen by Paul Bartsch, and referenced in three other publications.
|
Iowa Ornithologists' Union Records Committee
|
Magnificent Frigatebird
|
Burlington
|
|
|
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Iowa Ornithologists' Union | MS 166
|
7
|
15
|
Records Committee review for rare bird sighting for Magnificent Frigatebird circa 1896
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Zoological specimens Taxidermy
|
1896-01-01
|
1993-08-16
|
Manuscript, graphic, and printed material
|
Records Committee review for a Magnificent Frigatebird at La Porte City in Black Hawk County, IA around 1896. Includes a record review document with votes, the original sighting record found in the publication Note in Iowa Ornithologist 2:34 by Morton E. Peck, and referenced in two other publications.
|
Iowa Ornithologists' Union Records Committee
|
Magnificent Frigatebird
|
La Porte City
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
15
|
Records Committee review for rare bird sighting for Anhinga at Union Grove Lake in 1967
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Behavior Birds--Identification Rare birds
|
1967-04-05
|
1993-08-16
|
Manuscript, graphic, and printed material
|
Records Committee review for an Anhinga at Union Grove Lake in Tama County, IA on April 5, 1967. Includes a record review document with votes and the original sighting record found in the publication Anhinga, third record for Iowa in Iowa Bird Life 37:53 by Evelyn Ehlers.
|
Iowa Ornithologists' Union Records Committee
|
Anhinga
|
Union Grove Lake
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
14
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Records Committee review for rare bird sighting for Anhinga at Riverton in 1953
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Behavior Birds--Identification Rare birds
|
1953-10-18
|
1993-08-16
|
Manuscript, graphic, and printed material
|
Records Committee review for an Anhinga near Riverton in Fremont County, IA on October 18, 1953. Includes a record review document with votes and the original sighting record found in the publication A sight record of the Anhinga in Fremont County in Iowa Bird Life 23:72 by Mrs. William H. Collins.
|
Iowa Ornithologists' Union Records Committee
|
Anhinga
|
Riverton
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
14
|
Records Committee review for rare bird sighting for Anhinga at Salem circa 1889
|
Administrative records Clippings (information artifacts) Field notes
|
Birds--Identification Rare birds Hunting
|
1889-01-01
|
1993-08-16
|
Manuscript, graphic, and printed material
|
Records Committee review for a Anhinga at Salem in Henry County, IA around 1889. Includes a record review document with votes, the original sighting record found in the publication Birds of Iowa by Rudolph Martin Anderson seen by Walter G. Savage, and referenced in another publication.
|
Iowa Ornithologists' Union Records Committee
|
Anhinga
|
Salem
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
14
|
Records Committee review for rare bird sighting for Neotropic Cormorant at Riverton Area, 1997
|
Administrative records Field notes Reports
|
Birds--Identification Ornithology--Technique Rare birds
|
1997-05-10
|
2000-11-24
|
Manuscript, graphic, and printed material
|
Records Committee review for a a Neotropic Cormorant at Riverton Area in Fremont County, IA on May 10, 1997. Includes a record review document with votes and the original sighting record found in the publication Details of Birds Fremont County Iowa by B.J. Rose, Doug Rose, and Roger Rose.
|
Iowa Ornithologists' Union Records Committee
|
Neotropic Cormorant
|
Riverton Wildlife Management Area
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
12
|
Records Committee review for rare bird sighting for Brown Pelican at Montpelier, 1969
|
Administrative records Clippings (information artifacts) Field notes Photographs
|
Birds--Identification Photography of birds Rare birds
|
1969-05-10
|
1993-09-07
|
Manuscript, graphic, and printed material
|
Records Committee review for a Brown Pelican at Montpelier in Muscatine County, IA on May 10, 1969. Includes a record review document with votes and the original sighting record found in the publication Brown Pelican in Muscatine County in Iowa Bird Life 42:51 by Peter C. Petersen photographed by Elmer Deters.
|
Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Montpelier
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
11
|
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.
|
Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Twin Lakes
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
11
|
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.
|
Iowa Ornithologists' Union Records Committee
|
Brown Pelican
|
Boone
|
|
|
|
Iowa Ornithologists' Union | MS 166
|
7
|
11
|
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 Iceland Gull at lake near Des Moines River, 1993
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-04-17
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull at lake near Des Moines River in unknown county, IA on April 17, 1993. Includes a record review document with votes and a documentation form submitted to the committee.
|
Sinclair, Jim
|
Iceland Gull
|
Des Moines River
|
small lake adjacent to D.M. River
|
|
The documentation form by Jim Sinclair is the only one submitted and forms the basis of this record. | Elimination of similar species: Appeared much paler than second year Herring Gull. | The original documentation form event lasted from 11:45:00/11:50:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull at Lake MacBride, 1993
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-04-16
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review of an Iceland Gull at Lake MacBride in Johnson County, IA on April 16, 1993. Includes a record review document with votes and a documentation form submitted to the committee.
|
Fuller, James L
|
Iceland Gull
|
Lake MacBride
|
Short rock jetty from south shore of south arm of Lake MacBride (Johnson County).
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. | Elimination of similar species: First year Thayer's Gull is generally darker, with noticably [sic] darker tail and primaries. First year Glaucous Gull is larger with a two-toned bill. | The original documentation form event lasted from 16:39:00/16:42:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull at Centennial Bridge at Davenport, 1993
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-02-07
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull at Centennial Bridge at Davenport in Scott County, IA on February 7, 1993. Includes a record review document with votes and a documentation form submitted to the committee.
|
Fuller, James L
|
Iceland Gull
|
Centennial Bridge
|
Below Centennial Bridge, Mississippi River, Scott County.
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Another observer includes Jim Scheib. | Elimination of similar species: This bird was much too small for a Glaucous Gull, and the generally whiter cast and two-toned bill would suggest a second-winter, compared to first-winter Iceland. | The original documentation form event lasted from 14:55:00/15:00:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull at Lock and Dam 14, 1993
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-01-31
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull at Lock and Dam 14 in Scott County, IA on January 31, 1993. Includes a record review document with votes and a documentation form submitted to the committee.
|
Fuller, James L
|
Iceland Gull
|
Lock and Dam 14
|
Lock & Dam #14, Mississippi River, Scott County.
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. | Elimination of similar species: Adult Kumlien's Gull is larger than Ring-billed, and smaller than Herring Gull, both of which have black areas at the end of both upper and underwing. | The original documentation form event lasted from 09:55:00/10:35:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull at Lock and Dam 14, 1993
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-01-31
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull at Lock and Dam 14 in Scott County, IA on January 31, 1993. Includes a record review document with votes and a documentation form submitted to the committee.
|
Fuller, James L
|
Iceland Gull
|
Lock and Dam 14
|
Lock & Dam #14, Mississippi River, Scott County.
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. | Elimination of similar species: [...] It was smaller than any of the Herring Gulls, almost totally off white (grayish-brown flecking), dark bill, gray-pink legs. | The original documentation form event lasted from 09:55:00/10:35:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull near Hancher Auditorium in Iowa City, 1993
|
Administrative records Field notes Photographs
|
Bird watching Ornithology Ornithology--Societies, etc
|
1993-01-16
|
1995-07-08
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull near Hancher Auditorium in Iowa City in Johnson County, IA on January 16, 1993. Includes a record review document with votes, a photograph, and three documentation forms submitted to the committee.
|
Fuller, James L
|
Iceland Gull
|
Hancher Auditorium
|
Iowa River near Hancher Auditorium, Iowa City (Johnson County).
|
|
The documentation form by Jim Fuller forms the basis of this record. Other documentation forms by Randall Pinkston and Thomas H. Kent were submitted. Other observers include Carl Bendorf, Jane Fuller, and many unidentified other observers. | Elimination of similar species: First year Thayer's Gull is overall darker, with darker primaries and a well defined dark tail band. Glaucous Gull is larger, and the first year bird has a two-toned bill. | The original documentation form event lasted from 09:35:00/09:45:00 and 12:25:00/12:30:00 on January 16, 1993 and 11:45:00/11:50:00 on January 19, 1993.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull at Red Rock Reservoir Dam, 1991
|
Administrative records Clippings (information artifacts) Correspondence Field notes Photographs
|
Bird watching Ornithology Ornithology--Societies, etc
|
1991-03-13
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for an Iceland Gull at Red Rock Reservoir Dam in Marion County, IA on March 13, 1991. Includes a record review document with votes, seven photographs, an article in Iowa Bird Life, correspondence about bird sighting and review, and eleven documentation forms submitted to the committee.
|
Schantz, Tim
|
Iceland Gull
|
Red Rock Dam
|
Below Red Rock Dam, Marion County, Iowa
|
|
The documentation form by Tim Schantz is the earliest and the one that forms the basis of this record. Other documentation forms by Jim Fuller, Ann Johnson, Thomas H. Kent, Diane Porter, Jim Sinclair, Stephen Dinsmore, James Dinsmore, Beth Proescholdt, and Mark Proescholdt were submitted later. Other observers include Dawn DeVore, Dick Tetrault, Jim Scheib, Beth Brown, Michael Porter, Eugene Armstrong, Eloise Armstrong, and many unidentified observers. | Elimination of similar species: [...] Iowa Birds mentions that there is a problem separating Iceland with Thayers. If there was any problem with this bird being anything it was a Glaucous Gull of the same age. However the bird was smaller than the Herring Gulls that were on the roost. Long wings will rule out the rare small race of Glaucous Gull. There are not to [sic] many birds that have primaries lighter than the mantle in the sitting bird.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Iceland Gull near Le Claire, 1985
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1985-12-27
|
1993-09-03
|
Rare birds documentation form
|
Records Committee review for a Iceland Gull near Le Claire in Scott County, IA on December 27, 1985. Includes a record review document with votes and two documentations submitted to the committee.
|
Brogie, Mark A. Wickham, Peter P.
|
Iceland Gull
|
Le Claire
|
[...] along the Mississippi River approximately one-half mile north of the Interstate 80 bridge in Scott County, Iowa.
|
|
The documentation form by Mark Brogie and Peter P. Wickham forms the basis of this record. Another documentation form by Paul Martsching was submitted. Another observer includes Steve Dinsmore. | Elimination of similar species: [...] The bird was in the company of several Herring Gulls (Larus argentatus) and three subadult Glaucous Gulls (Larus hyperboreus). Two of the Glaucous Gulls were light plumaged birds lacking a gray mantle and, since eye color was not noted, may have been either first or early second winter birds. The third Glaucous was quite buffy and was undoubtably [sic] a first winter bird. The Iceland Gull was first observed being chased by a light-phased Glaucous and was distinctly smaller and lighter colored. It also flew with a faster wingbeat and had a more buoyant flight than that of the larger bird. Glaucous Gulls were also observed chasing Herring Gulls but at no time was intraspecific chasing observed. During several instances two Glaucous Gulls were observed resting on the water or sitting on the ice together, but the Iceland always remained isolated from these birds. At one point the Iceland Gull circled overhead at a distance of approximately 40 yards in the company of a light-phased Glaucous and an immature Herring Gull, and characteristics between the species were well noted. The plumage of the Iceland was wholly white with a faint buffy tinge, yet distinctly whiter than the Glaucous Gull. The size difference between the Glaucous and the other two species was apparent as the Iceland and Herring were of approximately equal size. The head and bill of the Iceland Gull appeared less robust in shape than the Glaucous although both species had a bicolored bill with a flesh colored base and dark tip. [...] The brown barring of the undertail coverts of the Iceland appeared heavier and more noticable [sic] than in its white-winged congeneric counterpart, and contrasted particularly with the whitish tail. | The original documentation form event lasted for approximately twenty minutes.
|
Iowa Ornithologists' Union | MS 166
|
11
|
4
|
Records Committee review for rare bird sighting of Thayer's Gull at IPL Ponds in Pottawattamie County, 1989
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1989-10-29
|
1993-08-06
|
Rare birds documentation form
|
Records Committee review for a Thayer's Gull at IPL Ponds in Pottawattamie County, IA on October 29, 1989. Includes a record review document with votes and three documentation forms submitted to the committee.
|
Grenon, Alan G.
|
Thayer's Gull
|
MidAmerican Energy Ponds
|
Iowa, Pottawattamie County, south of Council Bluffs, the north pond of the Iowa Power and Light plant's ponds, two miles north of the county line (three miles north of the Bellevue exit on I-29), just east of Interstate highway 29.
|
|
The documentation form by Alan G. Grenon forms the basis of this record. Other documentation forms by Babs Padelford and Ross Silcock were submitted. Other observers include B.J. Rose, Doug Rose, Loren Padelford as well as four unidentified observers. | Elimination of similar species: The most likely similar species are Iceland and Herring Gulls. Iceland Gull (first winter) is eliminated by the combination of the following characters: wing-tip darker than body at rest; wing-tip and secondaries darker above than remainder of wing; tail marked above by a darker band covering most of the distal portion; a possible darker area around the eye. Herring Gull (first winter) is eliminated by the combination of the following characters: wing-tip at rest brown-tan, not black; wing-tip and secondary bar tan in flight, not black; primaries with thin, pale tips; tail bar tan, not black; bill all dark; bill and head delicate; bill thin. Glaucous Gull would have been larger relative to Ring-billed Gulls, with a massive bill light with a dark tip, large head, and wing-tips and secondaries would not have been darker than other upper parts. California Gull (first winter) would have black or near-black primaries, secondaries, tail, and a mostly pale bill with a black tip. Glaucous-winged Gull and hybrids thereof eliminated by bill and head structure and body size all smaller/finer in this bird, tail and wing pattern. AG. | The original documentation form event occurred around 09:30:00 on October 29, 1989, from 11:30:00/12:15:00 and around 14:00:00 on the October 30, 1989.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
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
|