倒飞鸟在西半球部分地方,有一种会倒着飞的蜂鸟,它们在飞行时,双翅扇动得异常迅速,常常一会儿向前飞,一会儿倒退着飞,向前向后,随心所欲。会笑鸟瑞典的针叶林中有一种鸟,身上长有十多只羽轮,形成十多张溥膜,当它飞行时,空气急剧地冲动习习轮上的薄膜,便会发出“呵呵”的类似人笑的声音。 In some parts of the Western Hemisphere, there is a hummingbird that will fly back and forth. They fly flapping their wings very rapidly and often fly forwards while they fly backwards and forwards and backwards as often as they please. There will be a bird in Sweden's coniferous forest, with more than a dozen of feather rounds forming more than a dozen Pu films. When it is flying, the air impulsively touches the film on the wheel and will issue a “hehe” People laughing voice.