mammal哺乳动物;
carnivore食肉动物;
amphibian两栖类动物;
reptile爬行类动物;
plankton浮游生物;
predator猎食者;
extinction/die out灭绝;
origin of species物种起源;
hatch/incubation孵化;
offspring子孙;
unfertilized eggs未受精卵;
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