Here are some websites to get you started:
http://www.sazoo-aq.org/02meet/02sublinks/kangaroo.html
Kangaroos are marsupials. They have a pouch. Kangaroos grow fast. They
can leap up to 26 feet away but no more than 5 feet up in the air. A female
is a flyer, a male is a boomer, and a baby a joey. Kangaroos are found
in Australia.
http://www.worldalmanacforkids.com/explore/animals/kangaroo.html
A baby kangaroo lives in his mother's pouch after being
born for about 5 - 9 months. There are about 54 species of kangaroos. Some
species include the Great Gray Kangaroo, the Red Kangaroo, Wallabies, Rat
Kangaroos, and Musk Kangaroos.
http://www.nature.ca/notebooks/english/kanga.htm
Kangaroos can be as small as a rat or as big as a man. They are found in
Tasmania, Australia, and New Guinea. Australian kangaroos can move up to
88 km/h. Kangaroos defend themselves by going in the water and trying to
drown their attacker, or to back up against a tree and kick at their attacker.
http://www.enchantedlearning.com/subjects/mammals/marsupial/Kangaroocoloring.shtml
Kangaroos can live up to 6 years in the wild and up to 20 in captivity.
Most kangaroos are nocturnal. Kangaroos are in danger of extinction and
are considered pests because they damage crops. Kangaroos are herbivores
(eat plants) and swallow their food without chewing and they can go for
months without water.