ML59103121
投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
観察結果の詳細
SPECIES: Eurasian Wigeon, Anas penelope NUMBER OF INDIVIDUALS: One DATE AND TIME: May 21st, 2017 between 3:32 and 3:45 COUNTY: Bay EXACT LOCATION: Nayanquing Point State Wildlife Area. From the observation tower at the end of Kitchen Rd we walked due south along the dike that continues where Kitchen Rd ends. When the dike turns to the west we turned. Upon walking about 100 feet east we looked to the south and saw the flock of ducks where the wigeon was. The bird was between 50 and 75 feet out from our position. Using google maps to approximate the position the coordinates of the bird were about (43.767231, -83.941558). DETAILED DESCRIPTION OF APPEARANCE: Head was a red color, with a buff-yellow forehead. The bill appeared dark. The breast was a warm brown. The sides and back were a medium gray. A little sliver of white could be seen on the wings. A noticeable white femoral tract. Jet black rump. Tail appeared dark, although hard to tell as not seen in flight DESCRIPTION OF VOICE: No comment (not heard). BEHAVIORS OBSERVED: Bird was only seen on the water, seen feeding briefly. It loosely associated with a gadwall and clung close to Phragmites and Cattails most of the time. HABITAT: Bird was in a sheltered marsh in Saginaw Bay. I would believe the water the bird was in to be pretty shallow as Egrets were wading nearby. The bird kept quite close to the Phragmites and Cattails not surprising considering the two peregrines hanging around the point. SIMILAR SPECIES: I would like to address six similar taxa: American Wigeon (Anas americana), American Wigeon x Eurasian Wigeon hybrid (Anas americana x A. penelope), Green-winged Teal (Anas crecca carolinensis), Redhead (Aythya americana), Red-breasted Merganser (Mergus serrator), and Common Merganser (Mergus merganser). Well the first species that needs to be compared with the species I believe this bird to have been is the American Wigeon, Anas americana. There are many differences between male A. americana and male A. penelope. The most prominent of these two is the color of the head. The bird in question has a overall rufous head with a Buffy-yellow forehead. The Eurasian Wigeon has this head pattern as well. The American Wigeon is very different. It has a creamy-white head with a large green eye-patch. Another difference if the color of the back and sides. The bird in question had medium-gray back and sides as does a typical Eurasian Wigeon drake. An American Wigeon drake on the other hand demonstrates a warm brown back and sides. One more difference is the pattern of the pattern that can be seen on the wings while sitting on the water. In an American Wigeon there is a large white wing patch and a subsequent green patch. The bird in question only had a small white patch as does a drake Eurasian Wigeon. Another similar bird, although not at species level, is an American Wigeon x Eurasian Wigeon hybrid (A. penelope x A. americana). According to a document on the Arizona Field Ornithologists’ website hybrid males display a darker head than an American Wigeon but lighter than a Eurasian. Male Hybrids also show a small green ear patch. The color of the head on the bird in question was more consistent with a Eurasian Wigeon and the bird in question lacked a green ear patch. The third taxa I wish to address is the Green-winged Teal (Anas crecca carolinensis). The drake Green-winged Teal has a few big differences from a drake Eurasian Wigeon. The most noticeable of these differences is the size. The bird in question was about the same size as a nearby Gadwall, which lines up with Eurasian Wigeon. A Green-winged Teal is about six inches shorter than a Gadwall, a difference that should have been noticeable. Another noticeable difference is the head patterning. A Green-winged teal has a dark brown head with a green eye patch. The bird in question had a brown head with a buffy forehead and no eye-patch. A third difference between a Green-winged Teal is the rump. In the bird in question there was a black rump, like a Eurasian Wigeon. On the other hand, a Green-winged Teal has a buffy rump. A fourth species worth comparing is Redhead (Aythya americana). Redheads lack the buffy forehead observed on the bird in question. Redheads have a black breast as opposed to the tan of Eurasian Wigeon and the bird in question. The final two species I would like to address are Red-breasted and Common Mergansers (Mergus serrator and M. merganser). When I initially saw this bird I thought it was a merganser for a second. I then quickly realized the problems with this conclusion. The mergansers lack the buff forehead of the the bird in question. Eurasian Wigeon drakes have this forehead. The mergansers also have spiky feathers on the back of their head that the bird in question lacked. Mergansers would also have been larger in comparison to the gadwall. PREVIOUS EXPERIENCE WITH THIS SPECIES AND SIMILAR SPECIES: I have never seen a Eurasian Wigeon or an American x Eurasian Wigeon hybrid. I see American Wigeons, Redheads, Green-winged Teals, and Mergansers pretty often. I did not get to see them in direct comparison to the bird in question but we did have a male American Wigeon fly-by while observing the bird in question DISTANCE FROM BIRDS AND HOW THE DISTANCE WAS ESTIMATED: 50 to 75 feet. Distance was estimated using google maps. OPTICAL EQUIPMENT USED: Zhumell 10 x 42 Binoculars and a Vanguard Endeavor HD 82A Spotting Scope with up to 60 x 82 magnification LIGHT: Clouds moving quickly over head saw different levels of light. Sun to our left and was pretty high in the sky so no real shadows being cast. OTHER OBSERVERS: Scott Hicks, at least one other later in the day ebird report as well DID OTHERS AGREE WITH YOUR IDENTIFICATION?: Yes, Scott Hicks, who I was in the field with, agreed with me. It was reported later in the day via ebird as well. WHEN DID YOU FIRST WRITE DOWN NOTES?: When I got back to the observation tower around four. BOOKS AND REFERENCES: Audubon Birds App, Arizona Field Ornithologists’ website, Sibley second Edition REFERENCES CONSULTED BEFORE OR AFTER YOU WROTE DOWN DESCRIPTION?: The only reference consulted in the field was the Audubon Birds app. All others were consulted after I wrote down my notes HOW DID REFERENCES INFLUENCE DESCRIPTION: They made me include Green-winged Teal as a similar species as some noted it as such. Also helped me to know what a hybrid Wigeon looked like so I could point out contrasting features. WERE PHOTOS OBTAINED: Yes, they should be attached to this document. If not, please contact me so I can get them to you. They were digiscoped so quality leaves some to be desired. NAME: Edward Hicks DATE YOU FILLED OUT THIS FORM: May 22nd and 23rd 2017
テクニカル・インフォメーション
- モデル
- iPhone SE
- レンズ
- iPhone SE back camera 4.15mm f/2.2
- ISO
- 25
- 焦点距離
- 4.2 mm
- フラッシュ
- Flash did not fire, auto
- Fストップ
- f/2.2
- シャッタースピード
- 1/452 sec
- 大きさ
- 4032 pixels x 3024 pixels
- オリジナルのファイルサイズ
- 1.04 MB