作者
James M. Hartshorne 该用户提供的媒体文件
日期
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Red Rocks Lake Nat. Wildlife Refuge
Montana, United States
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NOTES: Cover density: OPEN; FLIGHT CALLS SOUND AS THOUGH BIRDS WERE IN A SOUND CHAMBER DUE TO THE FACT THAT THESE BIRDS FLY IN PAIRS AND THE TRUMPETING OF ONE BIRD IS QUICKLY FOLLOWED BY THE OTHER BIRD. 10MAR56 - 11MAR56. Based on the site, these almost certainly represent Trumpeter Swans, at the time recognized by some authors as C. c. buccinator - CAM - 27 October 2004. Habitat: Pond.
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- 16 May 2002 - Martha Fischer