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May 8, 2004 · 依據攝入與消耗有機質的形式，動物可分作數個不同的 生態 類群： 肉食動物 、 植食動物 、 雜食動物 、 食腐動物 / 食碎屑動物 [37] 以及 寄生動物 [38] ，不同類群動物間的互動形成複雜的 食物網 。. 肉食動物與雜食動物具有 捕食 行為，為一種 消費者-資源 ...
May 8, 2004 · 动物（英语： animal ）或称后生动物（学名： Metazoan ），是一群具有自主运动性的多细胞 真核生物，在生物分类学上构成名为动物界（ Animalia ）的分类阶层，与植物、真菌和原生生物一起构成了真核生物域下的四大界。
Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).
A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia ( / məˈmeɪli.ə / ). Mammals are characterized by the presence of milk-producing mammary glands for feeding their young, a neocortex region of the brain, fur or hair, and three middle ear bones.
