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Monotremes (/ ˈ m ɒ n ə t r iː m z /) 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.
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 ...
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).
This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs.
A Mammal, Bird or Something Else? Platypuses may have some duck-like characteristics, but they are a rare type of mammal called a monotreme. Monotremes differ from other mammals because they lay ...
Whales do not lay eggs. Since they are mammals, they give birth to live young. There are only five known monotremes, or egg-laying mammals, according to the Carnegie Museum of Natural History ...
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 ...
Echidnas and platypuses are the only egg-laying mammals, the monotremes. The average lifespan of an echidna in the wild is estimated at 14–16 years. Fully grown females can weigh about 4.5 kilograms (9.9 lb), the males 33% larger, at about 6 kilograms (13 lb). [12]