|
Rare bird documentation form for Ibis species at Dan Green Slough at Clay County, 1988
|
Field notes Forms (documents)
|
Birds--Identification Ornithology Rare birds
|
1988-10-05
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for an Ibis species at Dan Green Slough at Clay County, IA on October 5, 1988.
|
Brewer, Marion M.
|
Glossy Ibises
|
Dan Green Slough Wildlife Management Area
|
Dan Green Slough, Clay Co.
|
Marsh, shallow water, mud edge
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: I could not tell whether glossy or white-faced Ibis. | The original documentation form event lasted from 13:15:00/14:00:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
24
|
|
Rare bird documentation form for Prairie Falcon southeast of Larrabee, 1987
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1987-07-28
|
1987-07-29
|
Rare birds documentation form
|
Rare bird documentation form for two Prairie Falcons southeast of Larrabee in Cherokee County, IA on July 28, 1987.
|
Brewer, Marion M.
|
Prairie Falcon
|
Larrabee
|
3 east, 1 south of Larabee [sic], Iowa
|
Rough rolling pastureland (bluff of the Little Sioux River)
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: Merlin & Peregrine (see above) [...] It was to [sic] large to be a merlin. It didn't have the wide wisker [sic] of a Peregrine falcon. | The original documentation form event lasted from 14:15:00/14:25:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
35
|
|
Records Committee review for rare bird sighting of Prairie Falcon southeast of Larrabee, 1987
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1987-07-28
|
1993-09-07
|
Rare birds documentation form
|
Records Committee review of two Prairie Falcon southeast of Larrabee in Cherokee County, IA on July 28, 1987. Includes a record review document with votes and a documentation form submitted to the committee.
|
Brewer, Marion M.
|
Prairie Falcon
|
Larrabee
|
# 3 east, 1 south of Larabee [sic], Iowa
|
Rough rolling pastureland (bluff of the Little Sioux River)
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: Merlin & Peregrine (see above) [...] It was too large to be a merlin. It didn't have the wide wisker of a Peregrine falcon. | The original documentation form event lasted from 14:15:00/14:25:00.
|
Iowa Ornithologists' Union | MS 166
|
9
|
6
|
|
Records Committee review for rare bird sighting of Ferruginous Hawk in Cherokee County, 1985
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1985-03-28
|
1993-09-03
|
Rare birds documentation form
|
Records Committee review of a Ferruginous Hawk in Cherokee County, IA on March 28, 1985. Includes a record review document with votes, a summary of the review, and a documentation form submitted to the committee.
|
Brewer, Marion M.
|
Ferruginous Hawk
|
Cherokee County
|
Hwy 7 & M 31
|
Bean ground with some water ways (grass)
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: Redtailed hawk, no horizontal streaking onthe [sic] belly and the rufous colored legs. | The original documentation form event lasted from 16:40:00/16:45:00.
|
Iowa Ornithologists' Union | MS 166
|
9
|
1
|
|
Records Committee review for rare bird sighting of Wood Stork at Washta, 1985
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1985-10-11
|
1994-10-18
|
Rare birds documentation form
|
Records Committee review of a Wood Stork near Washta in Cherokee County, IA on October 11, 1985. Includes a record review document with votes and a documentation form submitted to the committee.
|
Brewer, Marion M.
|
Wood Stork
|
Washta
|
4 miles S of Washta
|
River bottom
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: snow goose. black secondarys [sic] | The original documentation form event occurred in the mid afternoon.
|
Iowa Ornithologists' Union | MS 166
|
8
|
1
|
|
Rare bird documentation form for White-faced Ibis at Cherokee Airport, 1986
|
Field notes Forms (documents)
|
Birds--Identification Ornithology Rare birds
|
1986-05-29
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a White-faced Ibis at Cherokee Airport in Cherokee County, IA on May 29, 1986.
|
Brewer, Marion M.
|
White-faced Ibis
|
Cherokee Municipal Airport
|
Cherokee Airport
|
Marsh
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. Other observers include Dick Bierman. | Elimination of similar species: Glossy ibis, because of the white around the bill and eye's. | The original documentation form event lasted from 14:49:00/15:02:00 and 15:40:00/15:50:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
25
|
|
Rare bird documentation form for White-faced Ibis at Cherokee Airport, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-05-29
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a White-faced Ibis at Cherokee Airport in Cherokee County, IA on May 29, 1986.
|
Brewer, Marion M.
|
White-faced Ibis
|
Cherokee Municipal Airport
|
local airport which has a couple of acres of wet land.
|
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. Other observers include Dick Bierman. | Elimination of similar species:From out of nowhere an ibis dropped into view, a night-heron sized bird, long decyred bill, rusty red front half of the dark back half with little irredesent [sic] green, rusty legs, and a dirty white that was over the forhead [sic] around the eye and to the lower manible [sic]. That told me I had seen a white-faced Ibis. | The original documentation form event lasted from 15:00:00/16:00:00.
|
Iowa Ornithologists' Union | MS 166
|
32
|
25
|
|
Rare bird documentation form for White-winged Scoter at Dog Creek, 1984
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1984-11-01
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form with additional notes for a White-winged Scoter at Dog Creek, in O'Brien County, IA on November 1, 1984.
|
Brewer, Marion M.
|
White-winged Scoter
|
Dog Creek County Park
|
Dog Creek 4 miles S.E. of Sutherland, Ia.
|
Small lake
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. Other observers include Jim Huber and Dick Bierman. | Elimination of similar species: None. | The original documentation form event occurred around 14:40:00/15:05:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
12
|
|
Rare bird documentation form for Golden Eagle at Rock Township in Cherokee County, 1985
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1985-02-27
|
1985-02-28
|
Rare birds documentation form
|
Rare bird documentation form for a Golden Eagle at Rock Township in Cherokee County, IA on February 27, 1985.
|
Brewer, Marion M.
|
Golden Eagle
|
Rock Township
|
Rock township sec 36, Cherokee County
|
Rolling hills with both pasture and crop land
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. Other observers include Vernon Bierman. | Elimination of similar species: Bald Eagle, white banded tail and white wing linings, dark head. | The original documentation form event lasted from 13:45:00/13:55:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
31
|
|
Rare bird documentation form for Golden Eagle near Silver Creek in Cherokee County, 1985
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1985-10-03
|
1985-10-04
|
Rare birds documentation form
|
Rare bird documentation form for a Golden Eagle near Silver Creek, 1 mile north & 1 mile West of the intersection of highways 59 and 31 in Cherokee County, IA on October 3, 1985.
|
Brewer, Marion M.
|
Golden Eagle
|
Silver Creek
|
1 mile north & 1 mile West of hwy. 59 & 31
|
Rolling hills pasture, with some pine trees.
|
The documentation form by Marion M. Brewer is the only one submitted and forms the basis of this record. Other observers include Vernon Bierman. | Elimination of similar species: Bald eagle, white wing patches. | The original documentation form event lasted from 16:15:00/16:25:00
|
Iowa Ornithologists' Union | MS 166
|
33
|
31
|
|
Records Committee review for rare bird sighting of Clark's Grebe at Trumbull Lake, 1994
|
Administrative records Clippings (information artifacts) Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1994-05-13
|
1996-04-25
|
Rare birds documentation form
|
Records Committee review for a Clark's Grebe at Trumbull Lake in Clay County, IA on May 13, 1994. Includes a record review document with votes, an Iowa Bird Life, and a documentation form submitted to the committee.
|
Brewer, Marion M.
|
Clark's Grebe
|
Trumbull Lake
|
Trumble Lake
|
Lake
|
The documentation form by Marion W. Brewer is the only one submitted and forms the basis of this record. | Elimination of similar species: Western, White in front, over & behind eye. | The original documentation form event lasted from 12:30:00/12:50:00 and 13:15:00/13:48:00.
|
Iowa Ornithologists' Union | MS 166
|
7
|
9
|
|
Records Committee review for rare bird sighting for Smith's Longspur east of Island View Park at Rathbun Lake, 1990
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1990-11-01
|
1993-07-17
|
Rare birds documentation form
|
Records Committee review for a Smith's Longspur east of Island View Park at Rathbun Lake in Appanoose County, IA on November 1, 1990. Includes a record review document with votes and a documentation form submitted to the committee.
|
Heusinkveld, Marjorie
|
Smith's Longspur
|
Island View Park
|
E. Island View, Rathbun Lake; Gravel rd. w. of Camp Hdqs.
|
Weedy ditch + field
|
The documentation form by Marjorie Heusinkveld is the only one submitted and forms the basis of this record. | Elimination of similar species: Lapland Longspur - no black bib or chestnut collar. No distinctive wing bar on Lapland - this bird had good wing bars. | The original documentation form event lasted from 09:30:00/09:40:00.
|
Iowa Ornithologists' Union | MS 166
|
13
|
42
|
|
Rare bird documentation form for Dark-eyed Junco near Ottumwa, 1981
|
Field notes
|
Birds--Behavior Birds--Identification Ornithology Rare birds
|
1981-12-19
|
1981-12-21
|
Rare birds documentation form
|
Rare bird documentation form for a Dark-eyed Junco near Ottumwa in Wapello County, IA on December 19, 1981.
|
Heusinkveld, Marjorie
|
Dark-eyed Junco
|
Ottumwa
|
South and west of RockBluff Road near Ottumwa, Iowa
|
Gravel road with many weeds and old pasture nearby.
|
The documentation form by Marjorie Heusinkveld is the only one submitted and forms the basis of this record. Other observers include Bill Heusinkveld. | Elimination of similar species: Similar to N. Junco, but the dark brown hood, rusty brown back and rusty sides declared him to be different | The original documentation form event lasted from 08:45:00/09:00:00.
|
Iowa Ornithologists' Union | MS 166
|
35
|
65
|
|
Rare bird documentation form for Golden Eagle at Rathbun Lake, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-03-20
|
1986-04-28
|
Rare birds documentation form
|
Rare bird documentation form for a Golden Eagle at Rathbun Lake in Appanoose County, IA on March 20, 1986.
|
Heusinkveld, Marjorie
|
Golden Eagle
|
Rathbun Lake
|
First bridge in Bridgeview area - Rathbun Lake - N. from Plano on County Rd 142
|
Open water with some ice - shoreline treed.
|
The documentation form by Marjorie Heuskinsveld is the only one submitted and forms the basis of this record. Other observers include Tom Johnson. | Elimination of similar species: Immature Bald Eagle. There were 3 immature Bald Eagles 'playing' in area at same time. They were more mottled with white through wings - no white bands on tails, one was beginning to show white on neck. | The original documentation form event lasted from 09:10:00/09:30:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
31
|
|
Rare bird documentation form for Common Snipe at Washington Township, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-06-12
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Common Snipe at Washington Township in Winneshiek County, IA on June 12, 1986.
|
Dietzenbach, Mark A.
|
Common Snipe
|
Washington Township
|
County: Winneshiek Block: Not in survey block Location in detail: Washington Township, section one, two miles south of Calmar. One hundred yards west of Hwy 150 where it crosses concrete bridge.
|
Wet meadow, sedgy areas, low woody growth nearby, pasture.
|
The documentation form by Mark A. Dietzenbach is the only one submitted and forms the basis of this record. | Elimination of similar species: American Woodcock; not quite their normal habitat, Plumper, rounded wings, they produce a whisting [sic] sound when flushed. Upland Sandpiper: shorter bill, no stripes on head or back. | The original documentation form event lasted from 20:42:00/20:42:05.
|
Iowa Ornithologists' Union | MS 166
|
34
|
27
|
|
Rare bird documentation form for Northern Harrier at St. Lucas, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-06-01
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Northern Harrier at St. Lucas in Fayette County, IA on June 1, 1986.
|
Dietzenbach, Mark A.
|
Northern Harrier
|
Saint Lucas
|
Section 20 nw. Two miles south of St. Lucas. 80 acre wet prairie pasture, west of W14 blacktop.
|
Open pasture, long grass, wet boggy areas, Open fields
|
The documentation form by Mark A. Dietzenbach is the only one submitted and forms the basis of this record. | Elimination of similar species: No other hawk species is pale gray and display a similar flight pattern or markings. | The original documentation form event lasted from 10:06:00/10:10:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
22
|
|
Rare bird documentation form for Golden Eagle near St. Lucas, 1986
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1986-05-28
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for a Golden Eagle near St. Lucas in Fayette County, IA on May 28, 1986.
|
Dietzenbach, Mark A.
|
Golden Eagle
|
Saint Lucas
|
County: Fayette. Block: Auburn Township. Location in detail: Section 3 n, Three miles northeast of St Lucas. Observed in flight heading due south
|
Paleozoic Plateau region, bluffs, scattered timber
|
The documentation form by Mark A. Dietzenbach is the only one submitted and forms the basis of this record. | Elimination of similar species: Turkey Vultures are smaller, their head is small and not feathered. They soar in a dihedral rocking and tilting unsteadily. Bald Eagle imm. has white areas in the wing linings, and shorter tail. | The original documentation form event lasted from 18:24:00/18:25:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
31
|
|
Rare bird documentation form for Henslow's Sparrow at Hickory Hill Park in Iowa City, 1982
|
Field notes
|
Birds--Behavior Birds--Identification Ornithology Rare birds
|
1982-04-25
|
1982-05-05
|
Rare birds documentation form
|
Rare bird documentation form for a Henslow's Sparrow at Hickory Hill Park in Iowa City in Johnson County, IA on April 25, 1982.
|
Snyder, Mark
|
Henslow's Sparrow
|
Hickory Hill Park
|
Hickory Hill Park, Iowa City
|
Grassy area with dry ragweed & bushes & 8'-10' saplings 50' from creek
|
The documentation form by Mark A. Snyder is the only one submitted and forms the basis of this record. Other observers include Mike Broz. | Elimination of similar species: Bairds Sparrow. Henslow's has olive-yellow head which Bairds doesn't. Also Henslow's has rusty wings tips and rusty unforked tail of which Bairds does not. Henslow's olive yellow continues on the nape, where as Bairds has fine black streaks on nape. | The original documentation form event lasted from 17:25:00/17:45:00.
|
Iowa Ornithologists' Union | MS 166
|
35
|
57
|
|
Records Committee review for rare bird sighting of Snowy Plover at Riverton Wildlife Area, 1992
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1992-05-13
|
1994-10-18
|
Rare birds documentation form
|
Records Committee review of a Snowy Plover at Riverton Wildlife Area in Fremont County, IA on May 13, 1992. Includes a record review document with votes and a documentation form submitted to the committee.
|
Proescholdt, Beth Proescholdt, Mark
|
Snowy Plover
|
Riverton Wildlife Management Area
|
Riverton Wildlife Area - (Fremont Co.)
|
Huge mudflat area and lots of water
|
The documentation form by Mark and Beth Proescholdt is the only one submitted and forms the basis of this record. Other observers include Jim Fuller, Jim Scheib, Tom Kent, Eugene Armstrong, and Eloise Armstrong. | Elimination of similar species: A non-breeding plumaged Piping Plover would be the only bird that could be similar. A Piping Plover has a conspicuous white rump in flight and a distinctive call-a 'peep-lo" which was different from the high musical whistle which we heard. A Semipalmated Plover would be much too dark brown in color. | The original documentation form event lasted from approximately 15:00:00/15:03:00.
|
Iowa Ornithologists' Union | MS 166
|
9
|
18
|
|
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
|
|
Rare bird documentation form for Surf Scoter at Saylorville Reservoir, 1984
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1984-10-27
|
1984-10-29
|
Rare birds documentation form
|
Rare bird documentation form for five Surf Scoters at Saylorville Reservoir in Polk County, IA on October 27, 1984.
|
Dixon, Mark D.
|
Surf Scoter
|
Saylorville Lake
|
near the dam at Saylorville Reservoir, Polk County
|
Large reservoir, seen near rock dam
|
The documentation form by Mark D. Dixon is the only one submitted and forms the basis of this record. | Elimination of similar species: Distinguished from Black Scoter female or immature by two distinct white face spots. Distinguished from White-winged Scoter primarily by lack of white in secondaries. | The original documentation form event lasted from 13:30:00/15:45:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
11
|
|
Rare bird documentation form for Peregrine Falcon at Ames, 1985
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1985-06-05
|
1985-07-19
|
Rare birds documentation form
|
Rare bird documentation form for a Peregrine Falcon at Ames in Story County, IA on June 5, 1985.
|
Dixon, Mark D.
|
Peregrine Falcon
|
Ames
|
County: Story. City: Ames. Location in detail: West Ames along Lincoln Way (Old highway 30), near drive-in theater, was flying over a corn field and road
|
semi-rural, suburban area, was over corn field, stream or river nearby?
|
The documentation form by Mark D. Dixon is the only one submitted and forms the basis of this record. | Elimination of similar species: Only other falcons were possible. Was too large for Kestrel and had heavy black mask. Did not have black 'armpits' of Prairie Falcon and had distinct mask. Too large for Merlin and had distinct mask | The original documentation form event lasted from 12:00:00/12:05:00.
|
Iowa Ornithologists' Union | MS 166
|
33
|
34
|
|
Rare bird documentation form for Golden Eagle at White Pine Hollow, 1989
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1989-10-25
|
1989-11-02
|
Rare birds documentation form
|
Rare bird documentation form for a Golden Eagle at White Pine Hollow in Dubuque County, IA on October 25, 1989.
|
Rouw, Mark
|
Golden Eagle
|
White Pine Hollow State Park
|
White Pine Hollow Dubuque County Iowa
|
Stream valley bordered by steep bluffs in woodland
|
The documentation form by Mark D. Rouw is the only one submitted and forms the basis of this record. | Elimination of similar species: Immature bald eagle was eliminated because of this birds distinctive white patches and shorter beak. | The original documentation form event lasted from 12:00:00/12:00:30.
|
Iowa Ornithologists' Union | MS 166
|
33
|
31
|
|
Rare bird documentation form for White-winged Scoter at Cardinal Marsh, 1987
|
Field notes
|
Birds--Identification Ornithology Rare birds
|
1987-11-29
|
N/A
|
Rare birds documentation form
|
Rare bird documentation form for two White-winged Scoters at Cardinal Marsh in Winneshiek County, IA on November 29, 1987.
|
Dietzenbach, Mark A.
|
White-winged Scoter
|
Cardinal Marsh State Wildlife Area
|
Cardinal marsh Winneshiek Co.
|
Large open water area of water
|
The documentation form by Mark Dietzenbach is the only one submitted and forms the basis of this record. Other observers include Steve Marty. | Elimination of similar species: We had no reservations about identification. | The original documentation form event lasted almost an hour.
|
Iowa Ornithologists' Union | MS 166
|
33
|
12
|
|
Records Committee review for rare bird sighting of Ferruginous Hawk at Hichcock Nature Area, 1999
|
Administrative records Field notes
|
Bird watching Ornithology Ornithology--Societies, etc
|
1999-12-05
|
2000-11-28
|
Rare birds documentation form
|
Records Committee review of a Ferruginous Hawk at Hitchcock Nature Area in Pottawattamie County, IA on December 5, 1999. Includes a record review document with votes and a documentation form submitted to the committee.
|
Orsag, Mark
|
Ferruginous Hawk
|
Hitchcock Nature Area
|
Hitchcock Nature Area (Lodge Hawkwatch Point)
|
Loess Hills / Missouri River Valley. The bird was coming from out of the valley. It crossed the wooded ridges of HNA and headed southeast.
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The documentation form by Mark Orsag is the earliest and the one that forms the basis of this record. | Elimination of similar species: I considered 5 other species of raptor in total. I eliminated two possibilities (Rough-legged Hawk and Northern Harrier) within seconds of seeing the bird in question. I eliminated two others (Bald Eagle [imm.], and Red-tailed Hawk more or less during the minute or so that I had the bird in view. **** ** I reviewed, in my head, the fine points of the Krider's Red-tailed Hawk for a few seconds after the bird had disappeared from view. The fifth species came to mind just before I started writing this report (the next day). I retroactively eliminated it. In reconstructing my reasoning, I believe: Rough-leg was eliminated due to the unmarked white throat, breast, underwings, and underside. Northern Harrier was eliminated due [sic] the large size and robust shape of the bird, the flight pattern (especially wingbeat), the unstreaked white throat, etc. Immature Swainson's Hawk later eliminated by dark head, white wing patches on primaries, lack of dark flight feathers on underwing, unlikelihood of December sighting. Bald Eagle immature- (whitebelly I-II) was eliminated by the downpushing wingbeat, the colors of the bird's dorsal surface, the lack of a contrast on the dorsal surface between the brown-gray forward part of the wing and the darker flight feathers (a little known good fieldmark for Immature BE), and the confining of the white coloration to the primaries, etc. Red-tailed Hawk-This species, in light of its similar (but smaller) size and variable plumages, posed the greatest problems. The dark upper surface, dark head, pointed wings, and pattern of flight (dihedral in glide posture), as well as the distinct and identical nature of the white markings on the upperwings and the lack of patagial marks, "commas", or other dark markings on the underside, were considered in total and used to rule out the immature light-morph Red-tail and, on reflection, a partial albino Red-tail. Krider's Red-tailed Hawk was the toughest to rule out. Here are my reasons: 1. Krider's heads appear white/light in contrast to the darker (gray or brown) color of the back. This bird's head was not lighter in color (on top) than the back. Back coloring was too dark (brown-reddish) for Krider's-no white mottling seen. Wings were pointed not rounded. No 'headlight' fieldmark [sic] was seen and the 'points of light' fieldmark [sic] was. Dihedral in glide unusual but not impossible for a Red-tail, but the wingbeat (fluid and downpushing rather than centered on the downstroke at the wrist) did not look like a Red-tailed's. | The original documentation form event lasted from 09:00:00/09:01:00.
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Iowa Ornithologists' Union | MS 166
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