ML354926621
作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
媒体文件注释
One member of a likely pair of Craveri's Murrelets photographed in flight by Curtis A. Marantz on 11 July 2021 over the inner edge of the Thirty-Mile Bank 46.9 kilometers west-northwest of Point Loma at 32° 44’ 10” N, 117° 44’ 03” W, San Diego County, California.
观察细节
I think it was Lehman who initially called out these birds while we were cruising back south along the inner edge of the Thirty-Mile Bank approximately 47 kilometers west-northwest of Point Loma at 32° 44’ 10” N, 117° 44’ 03” W. We quickly stopped the boat and tried to approach these birds, but they soon took flight and vanished when they flew off to the north. I was able to get only one or two photos of these birds on the water, but unlike the vast majority of murrelets, these birds took off in our direction, and then flew to the side, thus providing us with far better opportunities than I usually get for in-flight photos, and I indeed managed to get one good photo of one of these birds in profile with the wings raised. We also heard these birds calling when they took flight, when one of them gave a soft, twittering series that I described as “pi, di, di, di, di…” I noted when these birds were in the water that they were small alcids with elongate bodies that sat low on the water, a relatively small head, and a short and moderately stocky neck, all typical of murrelets in this genus. I further noted on one or both birds that the bill was relatively long and slim, that the forehead was weakly sloping, and that the tail was cocked upward exposing the undertail coverts, but seemingly without the rounded tail extending much beyond the tips of the undertail coverts. I was wholly unable to see the wing structure on the birds when they were in the water, and I saw the legs and feet only when the birds took flight, and exclusively through the viewfinder of my camera. Both birds were quite blackish above, from the forehead and crown down through the face to a point below the eye, the back and sides of the neck, and the entirety of the back, exposed wings, rump, and upperside of the tail. I was unable to notice in the field the location of the black-and-white demarcation on the face, but I did check for, yet I failed to see, the small notch of white that extends upward just before the eye on at least most Scripps’s Murrelets. Contrasting sharply with the black upperparts, the throat and foreneck were strikingly white when seen on the swimming birds, and the underparts appeared to be almost entirely white when I saw these birds in flight. Unlike the underparts, however, the underwings were mostly if not entirely blackish, as seen quite clearly when these birds took flight. I also noted when I took my photos a dark hook on the side of the neck just before the shoulder, and this mark is clearly obvious in my photos. My photos also show that these birds had webbed feet that were dark in color, but I cannot now recall how well I saw this in the field through my camera. I am nevertheless confident that I noted in the field that the bill was black and that the eyes were dark.
技术信息
- 型号
- Canon EOS 7D Mark II
- 镜头
- EF100-400mm f/4.5-5.6L IS II USM
- ISO
- 500
- 焦距
- 400 mm
- 闪光
- Flash did not fire
- 光圈
- f/8.0
- 快门速度
- 1/1600 sec
- 尺寸
- 2063 pixels x 1399 pixels
- 原始文件大小
- 4.84 MB