Documents • Iowa State University • Avian Archives of Iowa Online

Title	Genres	Topics	Date (Start)	Date (End)	Type	Description	Creator/Author	Birds	Locations	Locality	Habitat	Remarks

Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Dam, 1989	Administrative records Clippings (information artifacts) Field notes Photographs	Bird watching Ornithology Ornithology--Societies, etc	1989-12-07	1993-08-06	Rare birds documentation form	Records Committee review for two Thayer's Gulls at Saylorville Dam in Polk County, IA on December 7, 1989. Includes a record review document with votes, a photocopy of a photograph on the cover page of Iowa Bird Life, and a documentation form submitted to the committee.	Dinsmore, Stephen J.	Thayer's Gull	Saylorville Dam	Saylorville Reservoir, Polk Co.	large reservoir	The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. \| Elimination of similar species: The size, uniform body and wing color, pale underside of the flight feathers, and tail band eliminates Herring and Glaucous/Iceland gulls, the most likely candidates for confusion. \| The original documentation form event lasted from 14:04:00/16:42:00.	Iowa Ornithologists' Union \| MS 166	11	3
Rare bird documentation form for Hermit Thrush at Spring Park, 1995	Field notes	Bird watching Birds--Identification Rare birds	1995-12-16	N/A	Rare birds documentation form	Rare bird documentation form for a Hermit Thrush at Osage Spring Park in Mitchell County, IA on December 16, 1995.	Goranson, Rita	Hermit Thrush	Osage Spring Park	Spring Park	natural spring - wooded area	The documentation form by Rita Goranson is the only one submitted and forms the basis of this record. Other observers include Al Goranson. \| The original documentation form event occurred around 13:00:00.	Iowa Ornithologists' Union \| MS 166	35	9
Rare bird documentation form for Scissor-tailed Flycatcher northeast of East Amana, 1981	Field notes	Bird watching Birds--Identification Ornithology Rare birds	1981-04-26	1981-05-28	Rare birds documentation form	Rare bird documentation form for a Scissor-tailed Flycatcher northeast of East Amana in Iowa County, IA on April 26, 1981.	Bendorf, Carl J.	Scissor-tailed Flycatcher	East Amana	2miles [sic] NE of East Amana, IA. Iowa County	Along dry sandy road in open rolling pastureland with scattered small to large trees. Across road was large open grassy field.	The documentation form by Carl J. Bendorf is the only one submitted and forms the basis of this record. Other observers include Lanny Haldy, Randy Graesser, Tom Kent, Tom Shires, and Rick Hollis. \| Elimination of similar species: Western Kingbird- would not have scarlet wing linings and distinct scissor type tail. This was an immature bird as an adult scissor-tail would have a tail twice as long as the body. There might also be more indication of red on the shoulder beside the folded wing. \| The original documentation form event lasted from 13:00:00/14:30:00.	Iowa Ornithologists' Union \| MS 166	34	73
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 15 near Davenport, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-12-31	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Lock and Dam 15 near Davenport in Scott County, IA on December 31, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Kent, Thomas H. (Thomas Hugh), 1934-	Thayer's Gull	Lock and Dam 15	Lock + Dam 15, Davenport, Scott Co., IA	Mississippi River	The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. \| Elimination of similar species: Translucent flight feathers and upper wing pattern and lighter tail band separate from Herring Gull \| The original documentation form event lasted from 14:30:00/14:35:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 13, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-12-28	1993-07-17	Rare birds documentation form	Records Committee review for two Thayer's Gulls at Lock and Dam 13 in Clinton County, IA on December 28, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Blevins, Brian L.	Thayer's Gull	Lock and Dam 13	Lock + Dam 13 on Mississippi River	Mississippi River Flyway just Below the Dam	The documentation form by Brian Blevins is the only one submitted and forms the basis of this record. Other observers include Corey Blevins, Lewis Blevins, and Jennifer Anderson. \| Elimination of similar species: Herring Gull -> eliminated by the light brown color continuous all the way throughout the wingtips, thus there was not a darkening towards the wing tips. The mantle was also lighter than those of the nearby Herring Gulls. \| The original documentation form event lasted from 14:30:00/14:50:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 15 near Davenport, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-12-15	1993-07-17	Rare birds documentation form	Records Committee review for two Thayer's Gull at Lock and Dam 15 near Davenport in Scott County, IA on December 15, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Blevins, Brian L.	Thayer's Gull	Lock and Dam 15	Lock + Dam 15 on Mississippi River	Mississippi River Flyway just below the Dam	The documentation form by Brian Blevins is the only one submitted and forms the basis of this record. Other observers include Corey Blevins, Lewis Blevins, and Peter C. Petersen. \| Elimination of similar species: Herring Gull -> Immature - eliminated by the light brown color continuous all the way throughout the wingtips, thus there was not a darkening towards the wing tips. Adult - eliminated by the light mantle getting lighter towards the wingtips, with just a few grey spots on the primaries. \| The original documentation form event lasted from 15:15:00/15:45:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-12-07	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on December 7, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Kent, Thomas H. (Thomas Hugh), 1934-	Thayer's Gull	Red Rock Dam	Red Rock Res., Marion Co., IA	below dam on river	The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include around twenty unidentified observers on IOU field trip. \| Elimination of similar species: Much lighter and more uniform than 1st winter Herring Gulls flying in area. \| The original documentation form event lasted from 08:00:00/09:00:00.	Iowa Ornithologists' Union \| MS 166	11	3
Record Committee review for rare bird sighting of Thayer's Gull at Gray's Lake, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-11-30	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Gray's Lake in Polk County, IA on November 30, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Cecil, Robert I.	Thayer's Gull	Grays Lake	Gray's Lake, Des Moines, Polk County, IA	Lake with some open water	The documentation form by Bob Cecil is the only one submitted and forms the basis of this record. Another observer includes Mary Michelle Cecil. \| Elimination of similar species: Herring much more "contrasty", including dark secondary bar, dark tail band, very dark towards ends of primaries. This bird was smaller than 1st wither [sic] Herring, as well as paler brown. \| The original documentation form event lasted from 10:30:00/11:00:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-11-25	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 25, 1991. Includes a record review document with votes and two documentation forms submitted to the committee.	Johnson, Ann	Thayer's Gull	Red Rock Dam	Below dam, Red Rock Reservoir, Marion Co., IA	Gravel bar and open river	The documentation form by Ann Johnson forms the basis of this record. Another documentation form by Thomas H. Kent was submitted. Other observers include Jim Fuller, Dick Tetrault, and Tim Schantz. \| Elimination of similar species: Herring Gull was eliminated by the light and uniform body color, pale gray primaries, secondaries and tailband, lack of a window from above, and lack of any color to the underside of the primaries. The bird certainly had the overall coloration of a first year Iceland Gull. However, Iceland Gull was eliminated based on the darker secondaries, complete gray tail band, and the darker webs to the outer primaries from above. \| The original documentation form event lasted from 16:10:00/16:50:00 on November 25, 1991 and 13:50:00/14:05:00 on November 28, 1991.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-10-24	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on October 24, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Johnson, Ann	Thayer's Gull	Red Rock Dam	Below dam, Red Rock Reservoir, Marion Co., IA	Gravel bar and open river	The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. \| Elimination of similar species: Herring Gull was eliminated by the light and uniform body color, brown as opposed to blackish primaries and tail band, lack of a window from above, and lack of any color to the underside of the primaries. Iceland Gull was eliminated based on the darker secondaries and wide, brown tail band. \| The original documentation form event lasted from 16:50:00/17:15:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Reservoir Dam, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-03-14	1993-07-17	Rare birds documentation form	Records Committee review for two Thayer's Gulls at Red Rock Reservoir Dam in Marion County, IA on March 14, 1991. Includes a record review document with votes and two documentation forms submitted to the committee.	Johnson, Ann	Thayer's Gull	Red Rock Dam	Below dam, Red Rock Reservoir, Marion Co., IA	Gravel bar and open river	The documentation form by Ann Johnson is the one that forms the basis of this record. Another documentation form by Diane Porter was submitted. Other observers include Beth Brown and Tim Schantz. \| Elimination of similar species: Herring Gull was eliminated by the light and uniform body color, brown as opposed to blackish primaries and tail band, bill and head structure, and lack of any color to the underside of the primaries. Iceland Gull was eliminated based on the darker secondaries and wide, brown tail band. \| The original documentation form event lasted from 10:20:00/10:40:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 19 at Keokuk, 1991	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1991-02-16	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Lock and Dam 19 at Keokuk in Lee County, IA on February 16, 1991. Includes a record review document with votes and a documentation form submitted to the committee.	Allen, Reid I.	Thayer's Gull	Lock Number 19	Lock & Dam #19 - Keokuk, Iowa	River channel with open water below dam extending 3/4 mile from dam	The documentation form by Reid Allen is the only one submitted and forms the basis of this record. Other observers include Pam Allen, Eugene Armstrong, and Eloise Armstrong. \| Elimination of similar species: First-winter Herring gulls (many were present) had blackish wingtips. Juvenile Iceland gull wingtips lack dark edging on primaries as do those on Glaucous-winged Gull. \| The original documentation form event lasted from approximately 10:30:00/10:50:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Red Rock Dam, 1990	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1990-11-21	1993-07-17	Rare birds documentation form	Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 21, 1990. Includes a record review document with votes and a documentation form submitted to the committee.	Fuller, James L	Thayer's Gull	Red Rock Dam	Below Red Rock Dam- Marion County	River	The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include Ann Johnson, Chuck Fuller, and Jane Fuller. \| Elimination of similar species: Herring Gull (first winter) compared above. [...] I first saw this bird flying, and the underwing was translucent throughout the primaries to the end of the wing (Herring Gull had dark outer primaries, although most also had a lighter window type area medial to this dark area). The bird was about the same size or a little smaller than the Herrings. The upperwing in flight was much lighter in the primaries than the first winter herrings. [...] It had a more rounded head than the herrings. [...] It's color was more uniform than the herrings and also lighter- a brownish color. There was a dark smudge around the eye. The feather edging (whitish) provided more contrast with the brown on the back than in the herrings, and the folded tail was brownish, not black. When in flight the tail band was brownish not blackish like the herrings. \| The original documentation form event lasted from 13:15:00/13:45:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Pool 19 on the Mississippi River near Montrose, 1988	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1988-12-31	1993-08-04	Rare birds documentation form	Records Committee review for a Thayer's Gull at Pool 19 on the Mississippi River near Montrose in Lee County, IA on December 31, 1988. Includes a record review document with votes and a documentation form submitted to the committee.	Dinsmore, Stephen J.	Thayer's Gull	Pool 19	Pool 19 of Mississippi R., near Montrose, Lee Co., IA	resting on ice and flying over river with other gulls	The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Another observer includes Bart Ballard. \| Elimination of similar species: wing pattern, tail pattern, rounder head, and even color of body eliminates similar Herring Gull. \| The original documentation form event lasted from 10:15:00/10:25:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 15 in Davenport, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-12-17	1993-08-06	Rare birds documentation form	Records Committee review for a Thayer's Gull at Lock and Dam 15 in Davenport in Scott County, IA on December 17, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Blevins, Brian L.	Thayer's Gull	Lock and Dam 15	Just above the Lock + Dam 15 (Davenport, Ia)	Frozen ice above the dam in the Mississippi River	The documentation form by Brian Blevins is the only one submitted and forms the basis of this record. Other observers include Corey Blevins and Lewis Blevins. \| Elimination of similar species: Herring Gull - eliminated by the dark eye and by the lack of black on the primary tips. \| The original documentation form event lasted from 15:30:00/15:42:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Dam, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-11-28	1993-08-06	Rare birds documentation form	Records Committee review for a Thayer's Gull at Saylorville Dam in Polk County, IA on November 28, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Dinsmore, Stephen J.	Thayer's Gull	Saylorville Dam	Saylorville Reservoir, Polk Co.-above dam	feeding with other gulls on large reservoir	The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Bob Myers. \| Elimination of similar species: The size, uniform body color, pale underside of the flight feathers, and dark bill eliminates othr [sic] gulls. Iceland Gull eliminated by uniform wing color without noticeably lighter wingtips. \| The original documentation form event lasted from 16:15:00/16:20:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Credit Island, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-11-24	1993-08-06	Rare birds documentation form	Records Committee review for a Thayer's Gull at Credit Island in Scott County, IA on November 24, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Petersen, Peter C.	Thayer's Gull	Credit Island	Credit Island harbor	ice covered Miss. River backwater	The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Jim Fuller, Brian Blevins, Corey Blevins, Lewis Blevins, Thomas H. Kent, John Daniels, and Ken Lowder. \| Elimination of similar species: Herring Gull - dark brown primary tips, lacked silvery below wings. lack smudge on head \| The original documentation form event lasted from 08:45:00/08:50:00 and 15:30:00/15:45:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Lock and Dam 19 at Keokuk, 1989	Administrative records Field notes Photographs	Bird watching Ornithology Ornithology--Societies, etc	1989-11-24	1993-08-06	Rare birds documentation form	Records Committee review for two Thayer's Gulls at Lock and Dam 19 at Keokuk in Lee County, IA on November 24, 1989. Includes a record review document with votes, four photographs, and a documentation form submitted to the committee.	Cecil, Robert I.	Thayer's Gull	Lock Number 19	Behind Lock and Dam 19 at Keokuk in Lee County, Iowa (Iowa side)	River (Mississippi)	The documentation form by Robert Cecil is the only one submitted and forms the basis of this record. Other observers include John Cecil, Tom Kent, and Francis Moore. \| Elimination of similar species: Only probable similar species is Herring, which has contrasty wings - dark trailing edge and darker wingtips. The Thayer's were obviously a lighter shade of brown than any Herrings present. I judged these birds to be somewhat smaller than any Herring. I could not totally rule out first year Glaucous-winged. According to NGS, Glaucous-wing has less mottling or scalloping. The Keokuk birds were obviously mottled. \| The original documentation form event lasted from 11:05:00/11:30:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting for Thayer's Gull at Red Rock Dam, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-11-08	1993-08-06	Rare birds documentation form	Records Committee review for a Thayer's Gull at Red Rock Dam in Marion County, IA on November 8, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Proescholdt, Beth	Thayer's Gull	Red Rock Dam	Red Rock	below dam	The documentation form by Beth Proescholdt is the only one submitted and forms the basis of this record. Another observer includes Mark Proescholdt. \| Elimination of similar species: It was lighter + more evenly colored than a Herring Gull, larger than Ring-billed, too dark for an Iceland too small for a Glaucous. \| The original documentation form event lasted from 08:50:00/09:00:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at North Overlook Beach at Red Rock Reservoir, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-11-06	1993-08-06	Rare birds documentation form	Records Committee review for a Thayer's Gull at North Overlook Beach at Red Rock Reservoir in Marion County, IA on November 6, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Johnson, Ann	Thayer's Gull	North Overlook Park	North Overlook Beach, Lake Red Rock, Marion Co, IA	Sandy beach on man-made reservoir	The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. \| Elimination of similar species: Iceland Gull - basically eliminated by darker color and narrow chocolate edges to outer primaries. Kumlien's - presence of tail band would seem to eliminate Herring - eliminated by combination of: structure and size of body and bill; shape of head; more uniform coloration above, especially lighter colored primaries; light flight feathers from below contrasting with darker wing lining; lighter color of tail band \| The original documentation form event lasted from 10:30:00/10:35:00.	Iowa Ornithologists' Union \| MS 166	11	3
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 Bettendorf, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-02-18	1993-08-05	Rare birds documentation form	Records Committee review for a Thayer's Gull at Bettendorf in Scott County, IA on February 18, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Johnson, Ann	Thayer's Gull	Bettendorf	Mississippi River, Bettendorf, Scott Co., IA	seen from shore just south of I80 in area of cabins	The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. \| Elimination of similar species: The primary identification was done through the size and shape of the head. The bird was lighter in color than the first-winter herring gulls in the same area and the wing pattern on both upper and lower sides eliminated herring, ring-billed and Iceland gulls. \| The original documentation form event lasted from 12:42:00/12:42:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull near Lindsay Park in Davenport, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-02-18	1993-08-05	Rare birds documentation form	Records Committee review for a Thayer's Gull near Lindsay Park in Davenport in Scott County, IA on February 18, 1989. Includes a record review document with votes and a documentation form submitted to the committee for this sighting.	Petersen, Peter C.	Thayer's Gull	Lindsay Park	Lindsay Park Boat Club harbor, east edge of Davenport Scott Co.	On ice shelf along Mississippi River, 40 yards from sea wa[...]	The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record.Other observers include Walter Zuurdeeg and many unidentified observers. \| Elimination of similar species: [...] Immature gull same size as nearby Herring Gulls. [...] Head smaller than Herrings, bill more slight, black, + not thickened at the tip, compared to Herrings. When wings spread - this was seen twice, the upper surface seemed fairly uniform with no dark tip pattern as in the Herrings. \| The original documentation form event lasted from 09:50:00/09:55:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Dam, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-01-28	1993-08-05	Rare birds documentation form	Records Committee review for a Thayer's Gull at Saylorville Dam in Polk County, IA on January 28, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Johnson, Ann	Thayer's Gull	Saylorville Dam	Saylorville Lake, Polk Co., IA	dam on Des Moines River forming reservoir	The documentation form by Ann Johnson is the only one submitted and forms the basis of this record. \| Elimination of similar species: The primary identification was done through the size and shape of the head. Other similar gulls do not share this "dove head." The bird was confirmed by the silvery underwings and very little dark coloring on the upper side of the primaries, characteristics not shared by similarly gray-mantled gulls. \| The original documentation form event lasted from 08:40:00/08:40:00.	Iowa Ornithologists' Union \| MS 166	11	3
Records Committee review for rare bird sighting of Thayer's Gull near Horse Island near Davenport, 1989	Administrative records Field notes	Bird watching Ornithology Ornithology--Societies, etc	1989-01-02	1993-08-05	Rare birds documentation form	Records Committee review for a Thayer's Gull near Horse Island near Davenport in Scott County, IA on January 2, 1989. Includes a record review document with votes and a documentation form submitted to the committee.	Petersen, Peter C.	Thayer's Gull	Horse Island	downstream tip of Enchanted Island. Davenport, Scott Co. IA	Mississippi River - edge of open water, Iowa side	The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Brian Blevins and Corey Blevins. \| Elimination of similar species: Herring Gull - eye light, wing tips black with white windows, bill larger than Thayers. California Gull - eye light, wing tips black with white windows, yellow legs. \| The original documentation form event lasted from 13:35:00/13:50:00.	Iowa Ornithologists' Union \| MS 166	11	3