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Although they are different from almost all mammals in that they lay eggs, like all mammals, the female monotremes nurse their young with milk. Monotremes have been considered by some authors to be members of Australosphenida , a clade that contains extinct mammals from the Jurassic and Cretaceous of Madagascar, South America, and Australia ...
The class Mammalia is divided into two subclasses based on reproductive techniques: egg-laying mammals (yinotherians or monotremes - see also Australosphenida), and mammals which give live birth . The latter subclass is divided into two infraclasses: pouched mammals ( metatherians or marsupials ), and placental mammals ( eutherians , for which ...
Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
Monotremes differ from other mammals because they lay eggs instead of giving birth. There are only five species of monotremes, and they include the platypus and four species of echidnas (spiny ...
The second subclass is divided into two infraclasses: pouched mammals (the marsupials) and placental mammals. Australia is home to two of the five extant species of monotremes and the majority of the world's marsupials (the remainder are from Papua New Guinea, eastern Indonesia and the Americas).
The four extant species of echidnas and the platypus are the only living mammals that lay eggs and the only surviving members of the order Monotremata. [3] The diet of some species consists of ants and termites, but they are not closely related to the American true anteaters or to hedgehogs. Their young are called puggles.
Much of the argument is based on monotremes (egg-laying mammals): [120] [121] [122] While the amniote egg is usually described as able to evolve away from water, most reptile eggs actually need moisture if they are not to dry out. Monotremes do not have nipples, but secrete milk from a hairy patch on their bellies.
The egg-laying mammal, named after ... “The reason it appears so unlike other mammals is because it is a member of the monotremes – an egg-laying group that separated from the rest of the ...