Mammals That Lay Eggs
The most striking difference from other mammals is that monotremes lay eggs. Their bodies maintained some reptilian traits such as a cloaca.
They exhibit a low rate of reproduction.

Mammals that lay eggs. A female echidna possesses a pouch in the body where she lays an egg and it takes almost 10 days for the egg to hatch. The platypus and echidna are the only two mammal species which can lay eggs. They do not have teats to nurse their young.
They are classified under the subclass prototheria and belong to the order monotremata. Male and female platypuses avoid each other except when it is mating season which is between june and october. Beside egg laying monotremes possess other traits that separate them from other mammals.
This article on animalsake discusses some important aspects related to these unique mammals. Similar to other mammals they do lactate produce milk. Egg laying mammals belong to a group called monotremes.
Also they do not mate until they are at least four years old. Monotremes marsupials and placental mammals. But instead of having nipples like other mammals monotremes secrete milk through mammary gland openings in the skin.
Monotremes are the only mammals that lay eggs. This is not their only difference however and their existence goes to show how fascinating and diverse nature can be. Monotremes are long lived mammals.
There are three orders of the class mammalia. There are only two egg laying mammals on the planet. Long and short beaked echidna and platypus are the only mammals that lay eggs.
The baby is so small that it needs to spend three more months with mother in the pouch and it is one of the prominent egg laying mammals facts. Humans are mammals as are elephants lions buffaloes cats dogs sheep goats and many others. Their legs are on the sides of their bodies unlike other mammals whose legs are positioned under their bodies.
Together with the four species of echidna platypus is one of the five extant species of mammals that lay eggs. Mammals are warm blooded animals that give birth to live young. They instead excrete milk through pores that their young lap from.
This is not their only difference however and their existence goes to show how fascinating and diverse nature can be. After hatching a very small sized baby echidna comes out of the egg.
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