... that mammals produce their own body heat Mammary tissue - for the production of Milk Hair Follicles - for the production of Hair Generally, internal fertilization and harboring of young, however, ... Marsupials – eg The Kangaroo, which is a non-placental mammal Here, the development of the young is very complex, and a baby kangaroo is born very “uncooked”, and must crawl into the mother’s pouch ... out in Fetus… (all these Chordates (birds, mammals, reptiles, fish, have strikingly similar Embryonic Development) Chp 33 – Rise of the Mammals • Definition of a Mammal: Homoeothermic – meaning...