|
Rare bird documentation form for Long-tailed Duck at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-28
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Long-tailed Duck at Saylorville Reservoir in Polk County, IA on November 28, 1986.
|
Dinsmore, Stephen J.
|
Long-tailed Duck
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co. (near Jester Park)
|
large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: No other duck shows so much white color and a stubby, dark bill. | The original documentation form event lasted from 15:50:00/16:05:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
14
|
|
Records Committee review for rare bird sighting of Red-throated Loon at Saylorville Reservoir, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-01
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Red-throated Loon at Saylorville Reservoir in Polk County, IA on December 1, 1986. Includes a record review document, a summary of the review of the committee, and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Red-throated Loon
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co. (Cherry Glen Recreation Area)
|
swimming in open water off rock jetty
|
The documentation form by Steve Dinsmore is the earliest and the one that forms the basis of this record. | Elimination of similar species: Common Loon eliminated by smaller size, head posture, shorter, upturned bill, speckling on back, more rounded forehead, and sharp contrast between throat and back of neck. Pacific Loon eliminated by bill shape, head posture, speckling on back, two-toned (not three-toned) neck pattern, lack of chinstrap (not definitive, but helpful), and crown color not including the eye (should include the eye on Pacific Loon). | The original documentation form event lasted from 15:26:00/15:50:00.
|
Iowa Ornithologists' Union | MS 166
|
7
|
5
|
|
Records Committee review for rare bird sighting of Pacific Loon at Saylorville Reservoir, 1986
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-30
|
1994-02-05
|
Rare birds documentation form
|
Record Committee review for a Pacific Loon at Saylorville Reservoir in Polk County, IA, on November 30, 1986. Includes a record review document with votes, a request of the reconsideration of sight records, an Iowa Bird Life article, a summary of review, and two documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Pacific Loon
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co. (Cherry Glen Recreation Area)
|
large reservoir
|
The documentation form by Steve Dinsmore is the earliest and the one that forms the basis of this record. Another documentation forms by Paul Martsching was submitted later. | Elimination of similar species: Common Loon was eliminated by bill size, more rounded forehead, unspeckled back, and by the neck pattern. Red-throated Loon was eliminated by bill shape, lack of speckling on the back, and three-toned neck pattern. | The original documentation form event lasted from 08:43:00/08:45:00.
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
|
Records Committee review for rare bird sighting of California Gull at Cherry Glen Recreation Area at Saylorville Reservoir, 1986
|
Administrative records Correspondence Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-12-07
|
1996-01-25
|
Rare birds documentation form
|
Records Committee review for a California Gull at Cherry Glen Recreation Area at Saylorville Reservoir in Polk County, IA on December 7, 1986. Includes a record review document with votes, correspondence about the bird sighting and a request for re-evaluation of sighting, summary of the review, and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
California Gull
|
Cherry Glen Recreation Area
|
Saylorville Reservoir, Polk Co. (Cherry Glen Recreation Area)
|
sitting on ice with other gulls
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: Herring Gull eliminated by larger size, lighter mantle color, lack of black and red spots on bill, and wrong leg color (pink, although a very few Herring Gull show yellowish legs). Ring-billed Gull eliminated by smaller size, lighter mantle color, lack of a black ring on bill, and by yellower leg color. | The original documentation form event lasted from 13:13:00/14:08:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
1
|
|
Rare bird documentation form for Red-necked Grebe at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-08
|
1986-11-22
|
Rare birds documentation form
|
Rare bird documentation for a Red-necked Grebe at Saylorville Reservoir in Polk County, IA on November 8, 1986.
|
Dinsmore, Stephen J.
|
Red-necked Grebe
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The yellow bill, size, and light crescent on the cheek eliminates all other grebes. | The original documentation form event lasted from 12:15:00/12:20:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
13
|
|
Rare bird documentation form for Glaucous Gull at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-22
|
1986-11-24
|
Rare birds documentation form
|
Rare bird documentation form for a Glaucous Gull at Saylorville Reservoir in Polk County, IA on November 22, 1986.
|
Padelford, Babs Padelford, Loren
|
Glaucous Gull
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
|
The documentation form by Babs and Loren Padelford is the only one submitted and forms the basis of this record. Other observers include B.J. Rose and Steve Dinsmore. | Elimination of similar species: Much larger than Ring-billed gulls. Bill was also much larger than the bills of the Ring-billed gulls. | The original documentation form event lasted from 14:35:00/14:40:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
37
|
|
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 Merlin at Saylorville Reservoir, 1984
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1984-09-20
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Merlin at Saylorville Reservoir in Polk County, IA on September 20, 1984.
|
Dinsmore, Stephen J.
|
Merlin
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
flying through trees right along edge of water
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Eric Munson. | Elimination of similar species: Am. Kestrel was eliminated because of the lack of a rusty back, rusty tail and the unbarred undertail. Peregrine and Prairie Falcons eliminated by larger size and lack of strongly barred tail. Sharp-shinned and Cooper's hawks eliminated by the longer tails, lack of strong barring underneath tail, and by the broader, non-painted wings. | The original documentation form event occurred around 17:15:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
32
|
|
Rare bird documentation form for Northern Goshawk at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-06
|
1986-11-08
|
Rare birds documentation form
|
Rare bird documentation form for a Northern Goshawk at Saylorville Reservoir in Polk County, IA on November 6, 1986.
|
Dinsmore, Stephen J.
|
Northern Goshawk
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
flying over dam
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The larger size, gray underparts, and white undertail coverts eliminate both Sharp-shinned and Cooper's hawks. | The original documentation form event occurred around 14:55:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
25
|
|
Rare bird documentation form for Northern Goshawk at Saylorville Reservoir, 1985
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1985-03-10
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Northern Goshawk at Saylorville Reservoir in Polk County, IA on March 10, 1985.
|
Dinsmore, Stephen J.
|
Northern Goshawk
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large area of deciduous trees adjacent to reservoir
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: Other accipiters by lack of large size, extensive white above eye on the head and lack of clear gray/white underparts. | The original documentation form event lasted from 16:45:00/16:50:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
25
|
|
Rare bird documentation form for Long-tailed Duck at Saylorville Reservoir, 1988
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1988-04-29
|
1988-05-03
|
Rare birds documentation form
|
Rare bird documentation form for a Long-tailed Duck at Saylorville Reservoir in Polk County, IA on April 29, 1988.
|
Dinsmore, Stephen J.
|
Long-tailed Duck
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
swimming with coots and Bonaparte's Gulls on large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Eugene Armstrong, Eloise Armstrong, and Bery Engebretsen. | Elimination of similar species: No other duck has the white 'goggle', stubby bill, and dark underwings that this bird showed. | The original documentation form event lasted from 17:13:00/19:05:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
14
|
|
Rare bird documentation form for Long-tailed Duck at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-10
|
1986-11-13
|
Rare birds documentation form
|
Rare bird documentation form for a Long-tailed Duck at Saylorville Reservoir in Polk County, IA on November 10, 1986.
|
Dinsmore, Stephen J.
|
Long-tailed Duck
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: No other duck shows this color pattern. | The original documentation form event lasted from 15:45:00/15:55:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
14
|
|
Rare bird documentation form for White-winged Scoter at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-10-19
|
1986-10-24
|
Rare birds documentation form
|
Rare bird documentation form for a White-winged Scoter at Saylorville Reservoir in Polk County, IA on October 19, 1986.
|
Dinsmore, Stephen J.
|
White-winged Scoter
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The combination of large size, brown body color, light patches on the cheek, and white wing patch eliminates all other ducks. | The original documentation form event lasted from 16:00:00/16:15:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
12
|
|
Rare bird documentation form for Red-necked Grebe at Saylorville Reservoir, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-11-24
|
1986-11-25
|
Rare birds documentation form
|
Rare bird documentation form for a Red-necked Grebe at Saylorville Reservoir in Polk County, IA on November 24, 1986.
|
Dinsmore, Stephen J.
|
Red-necked Grebe
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large lake
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: Western Grebe eliminated by its longer neck, thinner bill, and lack of a white crescent on the cheek. | The original documentation form event lasted from 14:35:00/14:50:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
13
|
|
Records Committee review for rare bird sighting of a Red-throated Loon at Saylorville Reservoir, 1985
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1985-11-30
|
1996-08-18
|
Rare birds documentation form
|
Records Committee review for a Red-throated Loon at Saylorville Reservoir in Polk County, IA on November 30, 1985. Includes a record review document with votes, an Iowa Bird Life article, and two documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Red-throated Loon
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
open patch of water on large, frozen reservoir
|
The documentation form by Steve Dinsmore is the earliest and the one that forms the basis of this record. Other documentation form by Robert K. "Bob" Myers were submitted later. | Elimination of similar species: Common Loon eliminated by overall size, bill shape and size, and white spots on back. Arctic Loon eliminated by bill shape and black of crown not reaching eye. | The original documentation form event lasted from 11:00:00/13:00:00 and 13:45:00/14:15:00.
|
Iowa Ornithologists' Union | MS 166
|
7
|
5
|
|
Rare bird documentation form for Red-necked Grebe at Saylorville Reservoir, 1985
|
Field notes Forms (documents)
|
Birds--Identification Ornithology Rare birds
|
1985-10-26
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Red-necked Grebe at Saylorville Reservoir in Polk County, IA on October 26, 1985.
|
Moore, Francis L.
|
Red-necked Grebe
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
Open water on Saylorville Reservoir
|
The documentation form by Francis L. Moore is the only one submitted and forms the basis of this record. Other observers include Robert Myers. | Elimination of similar species: Western Grebe's neck is longer and thinner than this bird and is whiter on the front of the neck than this bird. Western's head is not crested toward the back of the head as in this bird. | The original documentation form event lasted from 10:45:00/10:50:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
13
|
|
Records Committee review for rare bird sighting of Lesser Black-backed Gull at Saylorville Dam, 1986
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-29
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for a Lesser Black-backed Gull at Saylorville Dam in Polk County, IA on November 29, 1986. Includes a record review document with votes, a summary of review, and three documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Lesser Black-backed Gull
|
Saylorville Dam
|
Saylorville Reservoir, Polk Co.
|
sitting on ice above dam
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Tanya Bray and Barbara Wilson were submitted. Other observers include Peter Wickham, Mark Brogie, 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
|
11
|
5
|
|
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
|
|
Records Committee review for rare bird sighting of Thayer's Gull at Saylorville Reservoir Dam, 1987
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1987-12-02
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review for two or more Thayer's Gulls at Saylorville Reservoir Dam in Polk County, IA on December 2, 1987. Includes a record review document with votes and five documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Thayer's Gull
|
Saylorville Dam
|
Saylorville Reservoir, Polk Co.
|
sitting on ice with other gulls
|
The documentation form by Steve Dinsmore forms the basis of this record. Other documentation forms by Francis L. Moore, Steve Dinsmore, and Mark Proescholdt were submitted. Other observers include Andy Fix, Beth Proescholdt, Eugene Armstrong, Eloise Armstrong, Bob Cecil, Bery Engebretsen, Jim Sinclair, and many unidentified observers. | Elimination of similar species: The overall dark color of the bird and the lack of paler wingtips eliminates first-winter Iceland Gull. The translucent flight feathers, uniform body color, lack of a "window" on the upperwing, smaller, thinner bill, rounder head, dark smudge around the eye, and smaller size eliminates first-winter Herring Gull. The uniform body color, lack of a dark tail band, and translucent flight feathers eliminates first-winter Lesser Black-backed Gull. | The original documentation form event lasted from 08:00:00/08:05:00.
|
Iowa Ornithologists' Union | MS 166
|
11
|
3
|
|
Records Committee review for rare bird sighting of Franklin's Gull at Saylorville Reservoir, 1988
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1988-12-25
|
1993-08-04
|
Rare birds documentation form
|
Records Committee review for one to two Franklin's Gulls in Saylorville Reservoir in Polk County, IA on December 25, 1988. Includes a record review document with votes and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Franklin's Gull
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large reservoir with some open water
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The dark mantle, black hood, white eye crescents, small size, and red bill and legs eliminates all other gulls. | The original documentation form event occurred around 14:40:00.
|
Iowa Ornithologists' Union | MS 166
|
10
|
19
|
|
Records Committee review for rare bird sighting of Laughing Gull at Saylorville Reservoir, 1995
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1995-10-19
|
2000-11-20
|
Rare birds documentation form
|
Records Committee review for a Laughing Gull at Saylorville Reservoir in Polk County, IA on October 19, 1995. Includes a record review document with votes, an article in Iowa Bird Life, and a documentation form submitted to the committee.
|
Dinsmore, Stephen J.
|
Laughing Gull
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large reservoir
|
The documentation form by Stephen J. Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: The only species of confusion was Franklin's Gull. The larger size, wing pattern, tail pattern, and bill size and shape all eliminated Franklin's Gull, many of which were nearby for comparisons. | The original documentation form event lasted from 09:40:00/10:32:00 and 13:45:00/14:20:00.
|
Iowa Ornithologists' Union | MS 166
|
10
|
18
|
|
Records Committee review for rare bird sighting of Pacific Loon at Saylorville Reservoir, 1986
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1986-11-22
|
1994-02-05
|
Rare birds documentation form
|
Records Committee review for a Pacific Loon at Saylorville Reservoir in Polk County, IA on November 22, 1986. Includes a record review document with votes, a reconsideration of bird sighting record, summary of review of records, an article in Iowa Bird Life, and three documentation forms submitted to the committee.
|
Dinsmore, Stephen J.
|
Pacific Loon
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co.
|
large reservoir
|
The documentation form by Steve Dinsmore is the earliest and the one that forms the basis of this record. Other documentation forms by Loren Padelford, Babs Padelford, and Bob Myers were submitted later. Other observers include Bob Myers, B.J. Rose, Jim Dinsmore, Gene Armstrong, and Eloise Armstrong. | Elimination of similar species: Common Loon eliminated by the small bill, rounded forehead, clear separation between the throat and back of neck, smaller size, chin strap, and dark, mostly unmarked back. Red-throated Loon eliminated by thicker, straighter bill, dark back, chin strap, and 3-toned neck pattern. | The original documentation form event lasted from 11:15:00 - 11:30:00 and 11:45:00.- 12:30:00 on November 22 and 08:00:00/08:35:00 on November 23.
|
Iowa Ornithologists' Union | MS 166
|
7
|
7
|
|
Rare bird documentation form for Black-legged Kittiwake at Saylorville Reservoir, 1987
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1987-10-25
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Black-legged Kittiwake at Saylorville Reservoir in Polk County, IA on October 25, 1987.
|
Martsching, Paul
|
Black-legged Kittiwake
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co, Iowa
|
|
The documentation form by Paul Martsching is the only one submitted and forms the basis of this record. Other observers include Steve Dinsmore. | Elimination of similar species: Was much larger than immature Little Gull. Sabine's doesn't have black bar on inner half of wings | The original documentation form event lasted from 09:30:00/09:45:00.
|
Iowa Ornithologists' Union | MS 166
|
34
|
40
|
|
Rare bird documentation form for Red-necked Grebe at Saylorville Reservoir, 1987
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1987-11-10
|
1987-11-12
|
Rare birds documentation form
|
Rare bird documentation forms for a Red-necked Grebe at Saylorville Reservoir in Polk County, IA on November 10, 1987.
|
Dinsmore, Stephen J.
|
Red-necked Grebe
|
Saylorville Lake
|
Saylorville Reservoir, Polk Co-above dam
|
swimming on large reservoir
|
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. | Elimination of similar species: Other grebes eliminated by the large size and light crescent on the cheek. | The original documentation form event occurred in the late afternoon.
|
Iowa Ornithologists' Union | MS 166
|
32
|
13
|
|
Rare bird documentation form for Red-throated Loon at Saylorville Reservoir, 1999
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1999-11-07
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for two Red-throated Loons at Saylorville Reservoir in Polk County, IA on November 7, 1999.
|
Dinsmore, James J.
|
Red-throated Loon
|
Saylorville Dam
|
Saylorville Reservoir, off of west end of dam
|
freshwater lake
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The documentation form by Jim Dinsmore is the only one submitted and forms the basis of this record. Other observers include Bery Engebretsen and Dennis Thompson. | Elimination of similar species: I spent a long time puzzling over these birds, both in the field and later when I had several references to consult. None of the guides I looked at showed a bird that looked like these. Common (a small one): removed on the basis of size (birds too small for Common Loon), the thinner and bicolored bill, and the color pattern on the neck. At this time of year, all of the Common Loons I have seen (and saw on Saylorville that day) were distinctly white on the front of the neck with some partial bands of brown extending back in to the white. Pacific Loon: Eliminated on behavior (head posture), lack of a distinct dark/white line along the side of the neck, lack of chin straps across neck, and presence of brown on front of neck. Also the gray/brown contrast between neck and back would point away from Pacific but not eliminate it. Red-throated Loon: This is what I first thought the birds were but as I viewed them, I convinced myself several times that they were Pacific Loons. However, the combination of characters listed above seem to eliminate the other two possible species and also are positive characters for the Red-throated Loon. One character that puzzled me was the size of the bill. At least some of the guides (Advanced Birding esp) show the Red-throated Loon as having a tiny bill, much smaller than on this bird but those illustrations do not match those in other guides which emphasize more the shape of the bill than the size. | The original documentation form event lasted from 07:45:00/08:45:00.
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Iowa Ornithologists' Union | MS 166
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32
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8
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