Mammalia
In our world, Mammalia make up the decent part of chordate terrestrial life, with impressive forays in both aquatic and aerial niches. The vast majority are placentals, that carry their young inside their bodies. All of today's mammals feed the young on milk, be it via teat or skin gap. Similarly on Different World, all mammals feed their young through milk. Monotremes use a similar technique to HE monotremes; infact, they have inverted nipples, were the young must push their bill into in order to recieve milk. Marsupials use teats as in our world. Allotheres use a large bulbous sac that swells with milk between the female's hind legs. The easiest way to check the gender of an allothere is to look for this sac; in a bizarre subversion of our world, a sac between the legs denotes a female instead of a male.
Allotheria - Triconodonts (Basilbrushes, Sets, Ratatosks, Faa's screecher, Ant-takers)
Theria - Marsupials (Pouchmonkeys, Kangarats, Roorats)
Monotremata - Monotremes (Pincushions, Duuks, Bunyip-buggers)
Allotheria - Triconodonts (Basilbrushes, Sets, Ratatosks, Faa's screecher, Ant-takers)
Theria - Marsupials (Pouchmonkeys, Kangarats, Roorats)
Monotremata - Monotremes (Pincushions, Duuks, Bunyip-buggers)