Platypus . ( Of the Gr. ?, -?, bird, and?, peak). 1. m. mammal of the order of the Monotremes, of size approximately of a rabbit, almost round head and JAWS broadened and covered by a corneal layer, by which its mouth is similar to the beak of a duck, with webbed, especially in the thoracic limbs, and body and tail feet covered with grey hair very fine. He lives in Australia and feed larvae, insects and small fish.