Why mammals cosidered as the most complex of all vertebrates?
Mammals are considered as most complex of all the vertebrates. The reason is very simple! Man belongs to this category. Man is supposed to be most evolved of all. (Supposed to be. For that man has done most of the damage to the earth.) Man has got the most intelligent brain. Most of the mammals are more or less intelligent. Human brain is the most complex of all the organs.
No. Chickens are birds, which is a different group of vertebrates from mammals. Birds lay eggs, while most mammals give birth to live offspring. The only exceptions to this are the platypus and echidna, which are monotremes, or egg-laying mammals. No. Chickens are birds, which is a different group of vertebrates from mammals.