Do all mammals give birth to live young?

 

                  True mammals all give birth to live young, which are smaller versions of the adult animal.

                  An unusual group of Australian mammals, called monotremes, lay eggs. The echidnas, or spiny anteaters, are monotremes. The other monotreme is the duck-billed platypus. The appearance of this animal is so strange that when it was first described scientists assumed that the animal was a clumsy fake! The duck-billed platypus has a leathery bill shaped like a duck’s beak; a body similar to an otter and a tail very much like a beaver’s. To make things even stranger, it has poisonous spurs on its legs too!

Picture credit: google