Members of the subclass prototheria, they are the only survivors of a group of mammals (*) that branched out some 150 million years ago, before the development of placental and marsupial mammals.
Infants of this order are known as puggles, although they have no relation or resemblance to the pug-beagle hybrid whose name they share. Members of the subclass prototheria, they are the only survivors of a group of mammals (*) that branched out some 150 million years ago, before the development of placental and marsupial mammals. Unlike other mammals, their urinary, digestive, and reproductive tracts all exit via a single cloaca. Consisting of echidna and platypus, FTP, name this unique egg laying order of mammal.
Infants of this order are known as puggles, although they have no relation or resemblance to the pug-beagle hybrid whose name they share.
{Monotremata} (also accept {Monotreme}s)