ML399298191
作者
日期
地点
- 年龄和性别
- 未成年性别未知 - 2
- 回放
- 未使用回放
媒体文件注释
immature Tundra Swans
观察细节
continuing birds seen after the sun was behind the coastal hill. Bird were moving off to the southwest when first seen and we watched them continued in that direction until they disappeared, either because the swam into a cove or flew off. These large birds appeared to have black bills that sloped up to the forehead, long necks most held straight that in the low light appeared grayer than the whiteish bodies; we could see no other color on the bills. Earlier reports suggested these birds were immature and there is a possibility they are the two seen at Laguna Lake yesterday. Both birds were seen bobbing their heads as they moved away (no calls heard), a behavior noted in Cornell's Birds of the World: "Head-bobbing: Head is raised and lowered vertically, each bob accompanied by a single call. Given prior to long-distance movements and probably signals intention to move (Scott 1978a, Black 1988). Probably serves as signal to other family and flock members as well as to mate." I checked where it looked like they moved to but could not located the birds. Photo/Video
技术信息
- 相机
- Cannon SX 70 HS
- 话筒
- internal
- 附件
- none
- 原始文件大小
- 116.64 MB