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. Learn about the only mammals that lay eggs, called monotremes, and their unique features and habitats Discover the platypus, the only venomous mammal, and the four echidna species, their spiny relatives. There are few living monotremes in the world and all are found in australia or new guinea. Monotremes differ from other mammals because they lay eggs
Monotremes do not produce milk through nipples but through secretions in mammary glands on their skin. With their ancient origins, strange biology, and limited range, platypuses and echidnas are natural marvels.
OPEN
