What are the differences between animals belonging to the Aves group and those in the mammalia group?
|1.||Most birds have feathers and they possess a beak.||They do not have feathers and the beak is also absent.|
|2.||They lay eggs. Hence, they are oviparous.||Some of them lay eggs and some give birth to young ones. Hence, they are both oviparous and viviparous.|
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