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Placental mammals
Nourish their growing embryos through a complete placenta attached to the wall the uterus. They give birth to live young and have teats.
Marsupials
Give birth to young at a very early (embroynic) stage. They have a pouch where the young spend time completing their development.
Monotremes
They lay eggs through cloaca and secret milk through pore in their skin.
Features of birds