What primitive animals Iive only in Australia? Which of the birds that live in Australia can laugh?

There are five species of primitive animals, and two of them can be found in Australia. They are the platypus and the echidna. These animals are different from common mammals, because they lay eggs and have no nipples, instead feeding their kids with milk through the special openings in their skin.

As for the Australian bird whose voice reminds laughter, its name is Kookaburra.