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9 lip 2024 · Monotremes have lost the gastric glands normally found in mammals, and acids are only secreted in their kidneys. This is largely due to their diet, which relies on soft-bodied invertebrates that do not require strong acids for digestion.
1 sie 2017 · Five species of monotremes exist, including four species of echidnas and the duck-billed platypus.
16 sie 2023 · A monotreme is any mammal that lays eggs. You probably know about the platypus, the most famous monotreme. But have you heard about echidnas? In addition to being the only mammals that lay eggs, these animals have a number of strange characteristics that set them apart from most other mammals alive today.
Monotremes are furred like mammals and produce milk for their young, yet they reproduce by laying eggs. The five extant monotremes -- the duck-billed platypus (Ornithorynchus anatinus) and four species of echidnas (Tachyglossidae) -- live in New Guinea and Australia.
The only surviving examples of monotremes are all indigenous to Australia and New Guinea although there is evidence that they were once more widespread, as Monotrematum is known from the Paleocene of South America. The extant monotreme species are the platypus and four species of echidnas.
Monotreme (monos, single + trema, hole) means "single opening" in Greek, and comes from the fact that their urinary, defecatory, and reproductive systems all open into a single duct, the cloaca. Other mammal females have separate openings for reproduction, urination, and defecation.
Monotremes (/ ˈmɒnətriːmz /) are mammals of the order Monotremata. 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.
