There are many marine mammals, all of which are placental, including dolphins, and the dugong, or sea-cow. The only placental mammals native to Australia are bats, of which there are over 80 species,...
No. Felines are animals closely related to cats (technically excluding the "great cats" ... lions, tigers, etc. ... who are felids but not felines). Placental mammals are those whose gestation...
There are no placental mammals which lay eggs. The only two egg-laying mammals in existence are the platypus and the echidna, which are classed as monotremes. They are still classified as mammals...