ML620411104
Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/traillii
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
I only saw one empid all day, and it was a Willow-like Flycatcher. Yellow box area. First found it early on in my visit. I had to take some work calls, but I mentioned it to Sara and Grigory, but we quickly lost the bird. Unfortunately there was a a Song Sparrow in the area that had a "whit" note in its song (heard with multiple people throughout the day -- very confident this sound was not given by the flycatcher). After walking around Ave C and finding very little else, I came back to this area and refound the bird. The bird appears to have a thin eyering with a small extension towards the back of the face, a greenish back contrasting with a grayish face, and a dark wing panel with crisp white edges to the tertials and secondaries. The wingbars look brownish to me though, and not very bright. Comparing photos with Jon's, this bird appears a little duller and more beat up with frayed edges to the feathers on the wings. Almost all our photos throughout the day were in deep shade inside the willows against a very bright background. About midday, I heard the bird give two Hammond's Flycatcher-like pip pip calls. It twice appeared to show a strong reaction to Alder Flycatcher tape. On one occasion it came flying in from a willow about 50 feet away, which was the only time I saw this bird in sustained open flight all day -- it was generally moving around skulkily within the willows most of the time. Another time it appeared to look at the source of the sound (cocking its head to look towards the car where I played the tape while sitting inside). Not sure if either or both of these were just coincidence. The vocalizations were heard after playback and not spontaneous. Unfortunately I was not able to record the calls the one time it made them. But I thought it was the same bird as Jon's Alder Flycatcher yesterday based on the pip calls. A number of other birders arrived in the afternoon and all saw the bird, but the bird did not vocalize at all or react to playback in any way that we could be sure. We tried playback every couple of hours, and I'm not sure there was any response after those two initial attempts around midday (perhaps taped out). Willow Flycatchers can be very vocal in migration. This bird showed no response to Willow Flycatcher tape played on multiple occasions. This bird comes down to the two pip calls I heard but could not record. It was frustrating to learn that Willow Flycatchers can make "pip" calls too, though I've never heard those before. Since I don't have recordings, and photos do not obviously match Jon's, I'm not sure how one can be sure of this bird otherwise without a spectrogram to look at. The fact that there was only one empid yesterday and only one empid today would make it extra depressing if one was an Alder and the other a Willow.
テクニカル・インフォメーション
- モデル
- NIKON D5600
- ISO
- 800
- 焦点距離
- 500 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/6.3
- シャッタースピード
- 1/1250 sec
- 大きさ
- 2843 pixels x 1891 pixels
- オリジナルのファイルサイズ
- 1.07 MB