http://en.wikipedia.org/wiki/Mammal
Most mammals are viviparous, giving birth to live young. However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals.In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian mammal.
Most mammals are viviparous, giving birth to live young. However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals.In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian mammal.
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