Cats dogs elephants giraffes whales dolphins porpoises and obviously homo sapiens are all viviparous mammals on the other hand there are mammals that lay eggs and are called monotremes the word monotreme is derived from the greek word monos meaning single and trema that means hole. This case is known as monotremes the term that refers to the structural differences in the animals of that group.
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Monotremes are egg laying mammals.
Name two mammals that lay eggs. Although they are classified as mammals they exhibit characteristics common with non mammalian animals. Platypus and echidnas are the only two mammals that lay eggs. There are many other differences in their body structure feeding habits diet and so on.
Mono means one and treme means opening. There are only two known species of egg laying mammals on the planet. Mammals are warm blooded animals that give birth to live young.
Only two kinds of egg laying mammals are on the planet today the echidna also known as spiny anteater and the duck billed platypus. The short beaked echidna and the duck billed platypus are the two mammals that lay eggs. It is a normal thing for mammals to not lay eggs but it is a rare and unique case when they do lay egg.
The echidna has spines all over its body along with short fur. Female platypus can lay two eggs at a time while an echidna can lay only one egg at a time. The short beaked echidna is the cousin of the long beaked mammal and it is much smaller in size.
The only surviving examples of monotremes are all indigenous to australia and new guinea although there is evidence that they were once more. The echidna resembles a porcupine but it is a completely different animal. Both species are found in new guinea australia and tasmania.
A female platypus lays eggs in the special holes or burrows while a female echidna on the other hand lays egg in her pouch. The latter lay eggs which contain all the nutrients they need for growth and are then born from the egg. The duck billed platypus and the spiny anteater also known as the echidna.
They have a cloaca which other mammals such as. As a matter of fact there are only 2 types of mammals that lay eggs in the world nowadays. Monotremes are mammals that lay eggs instead of giving birth to live young like marsupials metatheria and placental mammals eutheria.
The definition of monotreme is essentially a mammal which lays eggs but their name is defined by the opening to their sexual organs.
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