鸟类一共有多少种?

2025-03-16 13:20:45
推荐回答(5个)
回答(1):

鸟类在生物分类学上是脊椎动物亚门下的一个类。鸟是两足、恒温、卵生的脊椎动物,身披羽毛,前肢演化成翅膀,有坚硬的喙。鸟的体型大小不一,既有很小的蜂鸟也有巨大的鸵鸟和鸸鶓(产於澳洲的一种体型大而不会飞的鸟)。目前全世界为人所知的鸟类一共有9,000多种,光中国就记录有1,300多种,其中不乏中国特有鸟种。大约有120-130种鸟已绝种,与其他陆生脊椎动物相比,鸟是一个拥有很多独特生理特点的种类。

鸟类溯源於中生代侏罗纪,在该底层发现的始祖鸟是最著名的原始鸟,其身体特徵同时具有鸟类和爬行类共有的特徵,例如有牙齿,翅膀上有指爪。有学者提出恐龙是鸟类的祖先;在中国东北新发现的中华龙鸟和孔子鸟被认为是连接恐龙和鸟类的一环,更像是有羽毛的恐龙,比始祖鸟的年代更久远。

鸟类形成后逐渐进化,渐趋复杂,形成越来越多的种类,据一般推测,第三纪中新世是鸟类的全盛时期,后来冰期来临,鸟类受到沉重的打击,种群衰退,幸存至今的不及1,0000种,20余目。目前世界上共有9000余种鸟类,中国1329种鸟类。

回答(2):

全世界现存的大约有9000多种鸟类,过去大约120-130种已经灭绝.

回答(3):

全世界现存鸟类约有156科9000多种,

回答(4):

全世界现存鸟类约有156科9000多种,我国有81科1186种,占世界鸟类种数的14%,

回答(5):

平胸中目,善于跑,不会飞;企鹅中目,会潜水,游泳,不会飞;突胸中目,善于飞

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