學飛的蜂鳥
蜂鳥有極強的飛行能力，它們能敏捷地上下飛、側飛、倒飛，還能原位不動地停留在花前吸食花蜜。蜂鳥翅膀扇動極快，每秒鍾達80次之多。
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(0/) 2009-02-19 22:51:41
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(0/) 2008-12-04 20:02:45
(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
