Mammals {Theria} can have live births, rather than eggs laid outside body, and mammary glands. Eggs develop inside body. Babies emerge in fetal stage, requiring care of young during gestation and after birth. Parental care causes adult-behavior imitation. Theria developed from monotremes. Theria include Eutheria and marsupials.
Biological Sciences>Zoology>Kinds>Mammal>Theria
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224