ML168499361
作者
日期
地点
- 年龄和性别
- 成鸟,性别未知 - X
- 回放
- 未使用回放
媒体文件注释
Wind noise is considerable, so it is uncertain if one can make out swallow calls at all. (Video shows many swallows present, quite active.) I think I can, tho if so, they do not seem to have the buzzy character of more typical Bank Swallow calls. Reason for caution here is provided by Bent, who says (p. 415, in the volume containing the accounts of the swallows in his Life Histories of North American Birds) "Nest-building as well as burrow-digging is accompanied by much harsh,. unmusical twittering. Thereafter comparative quiet reigns during the period of egg-laying and incubation; vocalization is resumed as soon as the young are hatched."
观察细节
large colony in an active sand pit; shortly after photographing, the middle of the wall collapsed, perhaps 1/4 of the colony
技术信息
- 录音机
- Nikon Coolpix P900
- 话筒
- 附件
- 原始文件大小
- 102.87 KB