学飞的蜂鸟
蜂鸟有极强的飞行能力，它们能敏捷地上下飞、侧飞、倒飞，还能原位不动地停留在花前吸食花蜜。蜂鸟翅膀扇动极快，每秒钟达80次之多。
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(0/) 2007-12-13 20:06:02
(1/) 2007-11-27 20:14:41
(0/) 2009-02-19 22:51:41
(0/) 2009-02-02 19:26:58
(0/) 2008-12-18 19:34:26
(0/) 2008-12-04 20:02:45
(0/) 2007-12-13 20:06:02
(1/) 2007-11-27 20:14:41
