Koalas inhabit forests typically dominated by various species of eucalyptus trees.

They get most of their nutrition from just a few species of eucalyptus. These leaves are highly toxic, but koalas have a bacteria in their stomach that allows them to digest the toxins. 

Scientific Name: Phascolarctos cinereus adustus

Conservation Status: Vulnerable

Size: Average length: Females - 2.25 ft. Males - 2.5 ft.

Weight: 11 to 26 lbs. with males being larger than females

Koala
Nutrition
These herbivores get most of their nutrition from just a few species of eucalyptus. These leaves are highly toxic, but koalas have a bacteria in their stomach that allows them to digest the toxins.
Current and Historic Range
Koalas live in eastern Australia.
Habitat
They inhabit forests typically dominated by various species of eucalyptus trees.
Reproduction
These marsupials give birth in summer, usually December or January. After a gestation period of around 27-30 days the newborn joey makes its way to the female's pouch where it nurses for five to seven months. It stops nursing, sometime between six and twelve months.
Behaviors
Koalas conserve energy by moving slowly and sleeping up to eighteen hours each day.