Do All Mammals Lay Eggs

Cats dogs elephants giraffes whales dolphins porpoises and obviously homo sapiens are all viviparous mammals. All mammals have a type of sexual reproduction by which a cell from the female of a species is fertilized by a cell from the male.

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The duck billed platypus and the spiny anteater or echidna.

Do all mammals lay eggs. Mammals are warm blooded animals that give birth to live young. There are only two egg laying mammals on the planet. There are three orders of the class mammalia.

Yes there are egg laying mammals and they are known as monotremes. The former are known as placental mammals as the baby is fed via placenta in utero. On the other hand there are mammals that lay eggs and are called monotremes.

Placental mammals give birth to live young. They are named so because of the presence of single cloacal opening in their bodies that serves as a passage for eggs or sperms feces and urine. Monotremes marsupials and placental mammals.

Monotremes are the only mammals that lay eggs. The main differentiation within mammal species is between those which grow the fetus inside the body and those which lay eggs. Monotremes are the only mammals which lay eggs.

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