鸟类、爬虫及昆虫是卵生的。

Birds, reptiles and insects come from eggs.

哺乳动物繁衍后代时不是卵生，而是胎生。

Mammals don't lay eggs. They give birth to live babies.

凡禽鸟都是卵生，而它却是胎生的。

Every birds bird is oviparous, and it is viviparity however.

鸭嘴兽（Ornithorhynchusanatinus）是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spinyanteater），它产卵。

The platypus (Ornithorhynchus anatinus) is one of only two mammals, the other is the echidna (spiny anteater) that lays eggs.

针利用富黏性的长舌捕食蚂蚁，它与鸭嘴兽是仅存的卵生哺乳类动物。

He echidna USES its long sticky tongue to catch ants. The echidna and the platypus are the only existing egg - laying mammals.