ML20050851
Kullanıcı
Tarih
Konum
- Yaş
- Belirtilmemiş
- Cinsiyet
- Belirtilmemiş
Gözlem detayları
Adult; photos; iPhonescoped video; a clear adult Arctic Tern, although views were always rather distant at 1/2 to 1/3 mile or more. First spotted dipping down to the water's surface as I viewed from the northwest causeway off Naragansett Street. I then dashed over to the causeway along the east side (Route 7), and viewed form there for 40 minutes or more, which allowed identifiable scope views but was still too distant for photography. First identifiable by shape, a rotund, round-chested and very long tailed tern with a long, flowing tail. The wings were very narrow with a particularly long and narrow hand, and it always appeared short-necked. This shape alone gave the bird a distinctive appearance, but its feeding behavior also seemed unlike Common Tern, and it always dipped down to pick at the water's surface rather and never once dove. Its flight was exceptionally buoyant, often rising and falling and being buffeted left and right by the wind, giving it a very mobile flight but also with lots of rise and fall in each individual stroke. It was very hard to get an accurate sense of underparts coloration, and I never could see the bill color, but the bird clearly had a full black cap. The upperwings were entirely even pale gray with no hint of darker featehring in the primaries from above as well as no hint of a paler flash on the inner primaries, eliminating both Common and Forster's; this is shown by the photos. In addition, the underwing was very clearly translucent through all the flight feathers, and this set of a very crisp and narrow black trailing edge to the primaries of the 'hand'; both of these characters are diagnostic for Arctic and eliminate other Sterna terns. Finally, the tail was very long with the outer streamers at least as long as the central rects, giving the tail a strongly U-shaped center with very long outer rects (well shown in the photos). The outer rects seemed to flow and undulate in the breeze, very like the tail of a Roseate (which was easily eliminated by the gray underparts contrasting with the undertail) and most unlike the more rigid tail streamers of common and Forster's. SLR photos:
Teknik bilgiler
- Model
- Canon EOS 40D
- ISO
- 800
- Odak uzunluğu
- 380 mm
- Flaş
- Flash did not fire, auto
- Diyafram açıklığı
- f/5.6
- Shutter hızı
- 1/400 sec
- Ebatlar
- 857 pixels x 610 pixels
- Orijinal dosya boyutu
- 300.18 KB