|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 14, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-12-24
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 14 in Scott County, IA on December 24, 1995.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 14
|
Lock + Dam 14, Scott Co.
|
Mississippi R., on ice in backwater near dam
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: Size, yellow legs, not pure black eliminates other dark-mantled gulls. | The original documentation form event lasted from 08:40:00/08:50:00 approximately.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Glaucous Gull at Lock and Dam 14 near Davenport, 1979
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1979-12-16
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Glaucous Gull at Lock and Dam 14 near Davenport in Scott County, IA on December 16, 1979.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Glaucous Gull
|
Lock and Dam 14
|
Lock 14 N. of Davenport IA
|
Open river below dam Mississippi River
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Thomas Shires. | Elimination of similar species: Herring Gull immature - many present for comparison. All Herring Gull had variable black-gray on wings and tail Iceland Gull - large bill with pale base and size eliminate this species, also rare | The original documentation form event lasted from 09:00:00/09:05:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
37
|
|
Rare bird documentation form for Glaucous Gull at Lake Manawa, 1978
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1978-12-06
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Glaucous Gull at Lake Manawa in Pottawattamie County, IA on December 6, 1978.
|
Bray, Tanya Kovanda, Sandra Padelford, Babs
|
Glaucous Gull
|
Lake Manawa State Park
|
Lake Manawa, Iowa
|
Large, fresh water lake - 3/4 frozen
|
The documentation form by Tanya Bray, Sandy Kovanda, and Babs Padelford is the only one submitted and forms the basis of this record. Other observers include Rushton G. Cortelyou. | Elimination of similar species: All of us are familiar with herring gulls. The large size, white plumage, and absence of black on wing tips eliminated this species. | The original documentation form event lasted from 10:30:00/11:00:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
37
|
|
Rare bird documentation form for Lesser Black-backed Gull at Jester Park, 1999
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1999-12-06
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Jester Park in Polk County, IA on December 6, 1999.
|
Brees, Aaron
|
Lesser Black-backed Gull
|
Jester Park
|
Jester Park, Campground 4
|
|
The documentation form by Aaron Brees is the only one submitted and forms the basis of this record. | Elimination of similar species: Herring Gull was eliminated by structure, wing pattern, and tail pattern. California Gull was eliminated by bill coloration and tail pattern. Thayers Gull was eliminated by wing pattern, structure, and over all color.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Black-backed Gull species at Red Rock Reservoir, 1998
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1998-12-25
|
1998-12-26
|
Rare birds documentation form
|
Rare bird documentation form for a Black-backed Gull species at Red Rock Reservoir in Marion County, IA on December 25, 1998.
|
Proescholdt, Mark
|
Gulls
|
Lake Red Rock
|
Red Rock Reservoir - (Marion County)
|
Whitebreast area east of the church - large open water
|
The documentation form by Mark Proescholdt is the only one submitted and forms the basis of this record. | Elimination of similar species: This was probably a Lesser Black-backed Gull or a Great Black-backed Gull. | The original documentation form event lasted from 15:00:00/15:00:30.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Trickle Slough at Spirit Lake, 1999
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1999-11-06
|
1999-11-21
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Trickle Slough at Spirit Lake in Dickinson County, IA on November 6, 1999.
|
Schoenewe, Lee A.
|
Lesser Black-backed Gull
|
Trickle Slough
|
Trickle Slough, Spirit Lake, Dickinson County
|
Sandy point surrounded by open water
|
The documentation form by Lee A. Schoenewe is the only one submitted and forms the basis of this record. Other observers include Gary Grange. | Elimination of similar species: Greater Black-backed - size relative to Herring Gulls; Herring/Thayers - flight pattern + long wings in flight + perched | The original documentation form event lasted from 14:40:00/15:10:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Manhattan Point at West Okoboji Lake, 1999
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1999-11-21
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Manhattan Point at West Okoboji Lake in Dickinson County, IA on November 21, 1999.
|
Kenne, Matthew C.
|
Lesser Black-backed Gull
|
Manhattan Point
|
West Okoboji Lake, Dickinson Co., 21 Nov 1999
|
|
The documentation form by Matthew Kenne is the only one submitted and forms the basis of this record. Other observers include Lee Schoenewe. | Elimination of similar species: The bird was standing on Manhattan Point with several Herring Gulls of various ages and many more Ring-billed Gulls, facing quarter-on towards Lee Schoenewe and I. It was a dark 1st year gull, similar to, but slightly smaller than, other 1st year Herring Gulls present. It had an all black bill that was smaller than the other Herrings. [...] Lee and I waited for about 10 minutes for the bird to turn to the side, showing us blackish wingtips and dark tertials, eliminating the Thayer's Gull possbility we had been considering. The wing tips extended farther beyond the body than on the Herring Gulls. [...] There was no pale 'window' in the inner primaries as in a Herring Gull. | The original documentation form event occurred in the early afternoon for approximately 10 minutes.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Black-backed Gull species at Red Rock Reservoir, 1998
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1988-12-25
|
1988-12-26
|
Rare birds documentation form
|
Rare bird documentation form for a Black-backed Gull species at Red Rock Reservoir in Marion County, IA on December 25, 1988.
|
Proescholdt, Mark
|
Gulls
|
Lake Red Rock
|
Red Rock Reservoir - (Marion County)
|
Whitebreast area east of the church - large open water
|
The documentation form by Mark Proescholdt is the only one submitted and forms the basis of this record. | Elimination of similar species: This was probably a Lesser Black-backed Gull or a Great Black-backed Gull. | The original documentation form event lasted from 15:00:00/15:00:30 approximately.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Spring Run Wetland Area - Lair Tract, 1998
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1998-11-08
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Spring Run Wetland Area - Lair Tract in Dickinson County, IA on November 8, 1998.
|
Schoenewe, Lee A.
|
Lesser Black-backed Gull
|
Spring Run Wetland Complex, Lair Tract
|
Spring Run area just east of landfill, Dickinson Co.
|
Open field - corn stubble
|
The documentation form by Lee A. Schoenewe is the only one submitted and forms the basis of this record. Other observers include Ed Thelen. | Elimination of similar species: Herring Gull/California Gull by mantle color: Great-black-backed/Western/Slaty-backed by streaking on head + neck | The original documentation form event lasted from 09:30:00/10:10:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Red Rock Dam, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-12-27
|
1997-12-30
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Red Rock Dam in Marion County, IA on December 27, 1997.
|
Proescholdt, Mark
|
Lesser Black-backed Gull
|
Red Rock Dam
|
Below dam at Red Rock - (Marion County)
|
Gravel Bar below dam and churning water
|
The documentation form by Mark Proescholdt is the only one submitted and forms the basis of this record. Other observers include Dale Fye, Helen Fye, Pat Miller, and many others. | Elimination of similar species: The other black mantled gulls (Great Black-backed, Slaty-backed, Western, and Yellow-footed) are all much larger than this gull. | The original documentation form event lasted from approximately 10:20:00/11:10:00 and 13:30:00/14:15:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Red Rock Reservoir, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-12-26
|
1998-01-06
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Red Rock Reservoir in Marion County, IA on December 26, 1997 and December 30, 1997.
|
Dinsmore, Stephen J.
|
Lesser Black-backed Gull
|
Lake Red Rock
|
Red Rock Reservoir, Marion Co., IA (below dam)
|
river below dam
|
The documentation form by Stephen J. Dinsmore is the only one submitted and forms the basis of this record. Other observers include James J. Dinsmore, Kay Niyo, and many other observers. | Elimination of similar species: The combination of size, dark gray mantle, yellow legs and bill pattern eliminates other gulls, especially Great Black-backed, California, and Slaty-backed. | The original documentation form event lasted from 14:05:00/16:55:00 on December 26, 1997 and 13:40:00/16:05:00 on December 30, 1997.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Ottumwa, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-01-06
|
1997-01-07
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Ottumwa in Wapello County, IA on January 6, 1997.
|
Dinsmore, Stephen J.
|
Lesser Black-backed Gull
|
Ottumwa
|
Ottumwa, Wapello Co., IA
|
river
|
The documentation form by Stephen J. Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The bird was in the company of Ring-billed and Herring gulls which were easily eliminated on the basis of mantle color. California Gull is slightly smaller, is lighter-mantled, and shows more white in the primaries. Great-black-backed, Slaty-backed, and Western gulls are all larger and have heavier bills. | The original documentation form event lasted from 15:10:00/15:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull on the Mississippi River at Davenport, 1996
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1996-01-07
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull on the Mississippi River at Davenport in Scott County, IA on January 7, 1996.
|
Edwards, Chris
|
Lesser Black-backed Gull
|
Davenport
|
Mississippi River, Davenport, Scott Co.
|
River.
|
The documentation form by Chris Edwards is the only one submitted and forms the basis of this record. Other observers include Curtis Nelson. | Elimination of similar species: Great Black-backed Gull is much larger, has a blacker back, and pale pink legs. Herring Gull has a lighter gray mantle and pink legs. | The original documentation form event lasted from 13:45:00/15:00:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Thayer's Gull south of Muscatine, 1997
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1997-12-28
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Thayer's Gull south of Muscatine in Muscatine County, IA on December 28, 1997.
|
McKay, Kelly
|
Thayer's Gull
|
Muscatine
|
just south of Muscatine, IA., Muscatine county standing on ice shelves.
|
|
The documentation form by Kelly J. McKay is the only one submitted and forms the basis of this record. Other observers include Gerry White. | Elimination of similar species: The bird was about the size of a herring gull (slightly smaller), but much paler.
|
Iowa Ornithologists' Union | MS 166
|
34
|
35
|
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-02-04
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Scott County, IA on February 4, 1995.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Above Lock and Dam 15, Davenport, Scott Co., IA
|
Mississippi River, river open.
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include several unnamed people. | Elimination of similar species: The size and mantle color exclude Great Black-backed Gull. The mantle was too dark for a California Gull. Slaty-backed Gull would likely appear larger, have a darker mantle, and more white in tertials. | The original documentation form event lasted from 12:30:00/13:00:00 estimated.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1995
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1995-02-05
|
1995-02-21
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Scott County, IA on February 5, 1995 and February 12, 1995.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Mississippi River above Lock & Dam #15 (Scott County)
|
|
The documentation form by James Fuller is the only one submitted and forms the basis of this record. Other observers include Jim Scheib, Thomas Kent, Dan Dorrance, Barker, Peter C. Petersen, Eloise Armstrong, and Eugene Armstrong. | Elimination of similar species: The only other dark mantled gull with yellow legs is the Yellow-footed Gull. That bird has never been seen away from the extreme southwest portion of the country, and it should be much larger. | The original documentation form event lasted from 08:30:00/09:00:00 on February 5, 1995 and 11:40:00/11:55:00 on February 12, 1995.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-29
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Saylorville Reservoir in Polk County, IA on November 29, 1986.
|
Dinsmore, Stephen J.
|
Lesser Black-backed Gull
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
sitting on ice above dam
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Peter Wickham, Mark Brogie, Barb Wilson, Tanya Bray, and Bery Engebretsen. | Elimination of similar species: Great Black-backed Gull was eliminated by the smaller size, contrast between the wingtips and the rest of the wing, and by the heavy streaking on the head (head should be mostly white on a Great Black-backed Gull). California Gull was eliminated by the darker mantle, darker underwing and dark carpal bar, lack of a dark spot on the bill, and by the dark smudge at the base of the bill (this is characteristic of 3rd summer Lesser Black-backed Gulls and is never present on California Gulls). | The original documentation form event lasted from 10:08:00/12:10:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Cedar Lake, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-05
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Cedar Lake in Linn County, IA on January 5, 1992.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Cedar Lake
|
Cedar Lake, Linn Co., Iowa
|
backwater lake and cooling pond with some ice
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. | Elimination of similar species: The leg color and size eliminate other dark mantled gulls. | The original documentation form event lasted from 09:50:00/10:00:00 and 10:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-11
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on January 11, 1992.
|
Petersen, Peter C.
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Miss. R. between Bettendorf + Moline, Scott + R.I. Cos.
|
river channel
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. | Elimination of similar species: Great Black-backed - back not black, too small. Slaty-backed - a bit small, trailing edge of wing with narrow, not wide, white edge. Western - a bit small bill not larger + heavier than the several nearby Herrings. | The original documentation form event lasted from 08:50:00/09:00:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Lock and Dam 15, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-17
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Lock and Dam 15 in Davenport in Scott County, IA on January 17, 1992.
|
Kent, Thomas H. (Thomas Hugh), 1934-
|
Lesser Black-backed Gull
|
Lock and Dam 15
|
Above Lock + Dam 15, Davenport, IA
|
Frozen river
|
The documentation form by Thomas H. Kent is the only one submitted and forms the basis of this record. Other observers include Jim Fuller. | Elimination of similar species: Size and leg color eliminate other dark mantled gulls. | The original documentation form event lasted from 13:30:00/14:30:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-01-31
|
1992-02-07
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on January 31, 1992 and February 1, 1992.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Mississippi River between Moline, Illinois and Bettendorf, Iowa.
|
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include Charles Fuller and Jane Fuller. | Elimination of similar species: The only other dark mantled gull with yellow legs is Yellow-footed Gull, which has never been seen outside of the extreme southwestern part of the country. Yellow-footed gull is also larger than the Herring gull, but this bird was smaller in general size. | The original documentation form event lasted from 14:35:00/14:45:00 on January 31, 1992 and 09:50:00/10:00:00 on February 1, 1992.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull on the Mississippi River between Bettendorf, IA and Moline, IL, 1992
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1992-02-02
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull on the Mississippi River between Bettendorf in Scott County, IA and Moline in Rock Island County, IL on February 2, 1992.
|
Petersen, Peter C.
|
Lesser Black-backed Gull
|
Bettendorf Moline
|
Miss. River between Bettendorf, Scott Co., IA + Moline, R.I. Co., IL.
|
Main channel of Miss. River
|
The documentation form by Peter C. Petersen is the only one submitted and forms the basis of this record. Other observers include Ann Johnson and Gerald White. | Elimination of similar species: Great-Black-backed- seen with one, much smaller, mantle not black. Slaty-backed. This bird smaller than Herrings, legs were yellow. | The original documentation form event lasted from 13:30:00/13:35:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Greencastle Road at Coralville Reservoir, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-19
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Greencastle Road at Coralville Reservoir in Johnson County, IA on December 19, 1993.
|
Fuller, James L
|
Lesser Black-backed Gull
|
Coralville Lake
|
East of the north end of the Greencastle Road at the Coralville Reservoir (Johnson County).
|
Shallow water and mudflats.
|
The documentation form by Jim Fuller is the only one submitted and forms the basis of this record. Other observers include John McClure, Chris Edwards, and Jonnie Ellsworth. | Elimination of similar species: All other dark mantled gulls have a larger size. They also have pink legs, with the exception of Yellow-footed Gull, which has never been known to wander from Baja and Southern California. Yellow-footed gull is also considerably larger. No one disagreed with identification. | The original documentation form event lasted from 12:55:00/13:15:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull in the Cedar River at Cedar Rapids, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-18
|
1994-01-06
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull in the Cedar River at Cedar Rapids in Linn County, IA on December 18, 1993.
|
Wickham, Peter P.
|
Lesser Black-backed Gull
|
Cedar Rapids
|
Cedar River, on sandbar across from Cargill plant, Cedar Rapids, IA
|
Standing, walking around on sandbar
|
The documentation form by Peter Wickham is the only one submitted and forms the basis of this record. | Elimination of similar species: The dark mantle, yet whitish head, neck, and underparts identified it as an adult gull, and immediately eliminated Herring, Ring-billed and other gray or whitish-backed gulls. It was too small for Great Black-backed Gull, which has flesh-colored legs anyway, or Slaty-backed Gull, which has pinkish legs. The mantle wasn't truly black, as a Great Black-backed mantle would be. | The original documentation form event lasted from 14:15:00/14:25:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|
|
Rare bird documentation form for Lesser Black-backed Gull at Coralville Reservoir, 1993
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1993-12-18
|
1993-12-19
|
Rare birds documentation form
|
Rare bird documentation form for a Lesser Black-backed Gull at Coralville Reservoir in Johnson County, IA on December 18, 1993.
|
Bendorf, Carl J.
|
Lesser Black-backed Gull
|
Coralville Lake
|
Coralville Reservoir, Johnson County, Iowa
|
upper reaches of the Coralville Reservoir
|
The documentation form by Carl Bendorf is the only one submitted and forms the basis of this record. Other observers include Lanny Haldy, Randy Graesser, Dan Ray, Angela Ray, Kathleen Kuenstling, Randall Pinkston, Thomas Kent, Jim Fuller, and others. | Elimination of similar species: Of about 500 gulls total, nearly 90% were adult Ring-Billed Gulls and the rest were mostly winter adult and a few subadult Herring Gulls. [...] An adult gull in between the size of adjacent Ring-billed and Herring Gulls. It was noticeable larger than the Ring-bills; not too much smaller than the Herrings. It differed from the Herrings in being a little less barrel chested and a little slimmer, more horizontal in posture. | The original documentation form event occurred for 45 minutes during two sessions.
|
Iowa Ornithologists' Union | MS 166
|
34
|
36
|