Australian mammals

Australia is home to a wide range of mammals, including the largest number of marsupials still in existence and primitive egg-laying mammals such as the Short-beaked Echidna. In the seas around Australia, a wide range of cetaceans can also be found.
 

Koala

Monotremes

A primitive group of mammals that lay eggs, only found in Australia and New Guinea and consisting of only three species of echidna and the Platypus. The first monotremes arose in the cretaceous era, some 130 million years ago.
 
Order Monotremata
Short-beaked Echidna
 
 
 
 
 

 
 
 
 

 
 
 
 
 

Marsupials

Another ancient line of mammals where the young are reared in a pouch. Marsupials once were found over much of the world but now exist only in Australasia, South America and North America.
 
Order Peramelemorphia
Long-nosed Bandicoot
 
Order Diprotodontia
Koala
 
Common Brush-tailed Possum
 
Common Ring-tailed Possum
 
Musky Rat-kangaroo
 
Western Grey Kangaroo
 
Eastern Grey Kangaroo
 
Red-necked Wallaby
 
Quokka
 
Swamp Wallaby
 
 

Placental mammals

Placental mammals are the most advanced mammals, ranging from mice to humans and in many areas have displaced older lines such as the marsupials.
 
Order Chiroptera
Spectacled Flying-fox
 
Order Carnivora
New Zealand Fur Seal
 
Order Cetacea
Short-beaked Common Dolphin
 
Risso's Dolphin
 
Indo-Pacific Bottlenose Dolphin
 
Common Bottlenose Dolphin
 
Humpback Whale
 
 

 
References
P. Menkhorst and F. Knight, A Field Guide to the Mammals of Australia, 2nd edition, 2004.
www.wikipedia.org
Wilson and Reed's Mammal Species of the World - online database of mammals world-wide.