Platypus.

One of the most interesting animals is the Platypus.  This animal which looks like a fish, a bird and a duck all rolled into one, is found in Eastern Australia and Tasmania. 

The Platypus was classified as a mammal because it produces milk and is covered in coat of thick fur, once prized by hunters.  It has webbed feet and a flat bill, instead of a beak.
Platypus weigh between 1 - 5 lbs, with the males being larger than the females.  Males average about 20 inches, while females are about 17 inches.
The male Platypus has a spur on its hind foot that delivers a venom which is capable of causing severe pain to humans.   It does not care for its young, but retreats to its yearlong burrow. 
The female however, softens the ground in the burrow with dead, folded, wet leaves and fills the nest at the end of the tunnel with fallen leaves and reeds used for bedding material.  This material is dragged to the nest by tucking it underneath her curled tail.
In South Australia, the Platypus are reported only rarely from the Riverland area of the Murray River and have not been encountered in the lower reaches of the Murray since 1960.