Monotremes are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas.

Chiroptera- bats, the second largest group of mammals after rodents. ... Bats are flying mammals of the order Chiroptera. With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight.

Marsupials are non-placental mammals belonging to the infraclass (or order) Marsupialia. Marsupial females typically have an external pouch (called the marsupium, from which the name 'Marsupial' derives) in which the immature young are raised after birth until early infancy. The newborn typically crawl to this pouch after birth, and attach themselves to milk-secreting teats (nipples), and are nursed until they can survive outside the pouch.

Been some tricky questions coming through lately, 4 days since my last 10, I'll have to redeem myself tomorrow!