monotremes. marsupials. egg layers. viviparous with pouch. 6 species. 250 species. Class Mammalia. placentals. placental viviparity. 3,800 species (17 orders). “ Age of mammals”- beginning of Tertiary period- 70 mya
viviparous with pouch
3,800 species (17 orders)
-heat production by shivering and brown fat
-heat reduction through ears, tails, panting, burrowing or finding shade
can kill snakes
can roll in ball
"man of the forest"