20191228 凯利温泉中的黑嘴天鹅 必应壁纸

黑嘴天鹅 凯利温泉中的黑嘴天鹅 小号天鹅原产于北美，居住在美国北部和西部48个州以及加拿大和阿拉斯加的河流，湖泊和沿海小路附近。 根据它们的居住地，这些天鹅是常驻鸟类还是中距离迁徙者。 不过，他们都需要在冬季开阔水域，因为它们的饮食几乎全部是水生植物。 这也许就是为什么这张照片中的天鹅被怀俄明州的凯利暖泉水吸引的原因，即使雪在河岸边也不会冻结。

黑嘴天鹅是北美最大的水禽生物。 已知最大的雄天鹅，体重近40磅，翼展为10英尺。 尽管在20世纪初期，它们濒临灭绝，但如今估计有35,000只幼鹅。 即使有了很大规模的恢复，狩猎它们仍然是非法的。 是的，他们的声音听起来确实像喇叭，但Miles Davis却不是。 

原文:

Native to North America, trumpeter swans live near rivers, lakes, and coastal byways in northern and western US states in the lower 48, as well as in Canada and Alaska. Depending on where they live, these swans are either resident birds or medium-range migrators. What they all require, though, is open water during winter, since their diet consists almost entirely of aquatic plants. That may be why the swans in this image are drawn to the waters of Kelly Warm Springs in Wyoming, which won't freeze even as snow lines the banks.trumpeters are the largest living species of waterfowl in North America. The biggest known cob—that's a male swan--weighed almost 40 pounds and had a wingspan of 10 feet. Although in the early 20th century they came perilously close to extinction, today there's an estimated 35,000 trumpeters. Even with the tremendous recovery, it remains illegal to hunt them. And yes, their calls do sound like trumpets, but Miles Davis they aren't. Click below to listen.

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