A young kangaroo (macropus fuliginosus)

A young kangaroo (macropus fuliginosus) investigates the world from its mother's pouch in the zoo in Basel, Switzerland.

A Matschie's Tree Kangaroo

A Matschie's Tree Kangaroo, the only one at the Singapore Zoo is seen in the Fragile Forest section which houses animals in danger of extinction in Singapore.

Milla, a Matschie's tree kangaroo

This photo released by the Lincoln Children's Zoo, shows Milla, a Matschie's tree kangaroo. The Lincoln Children's Zoo is celebrating its first set of Matschie's tree kangaroo twins. The twins born last month to Milla and her mate Noru, brought in from the Toronto Zoo, make up half of the four documented Matschie's tree kangaroo births in 2008. The twins are in her pouch.

Australia's kangaroos

Australia's kangaroos are genetically similar to humans and may have first evolved in China, Australian researchers said on Tuesday.

Australian kangaroos

A mother and her joey kangaroo are seen at the Lucas Heights Nuclear Science Testing Facility in Sydney, Australia. Australian authorities have started the controversial killing about 400 kangaroos on the outskirts of Australia's capital of Canberra, animal rights activists said.

Albino kangaroo

An albino kangaroo named Milka is seen next to its mother at a zoo in Tashkent, the capital of Uzbekistan.

The cub was born 3 and a half months ago, but the zoologists have not examined it to determine its sex fearing they will harm the fragile kangaroo.

Australian kangaroos

A golfer studies the fairway as kangaroos eat the grass at a golf course.

A baby kangaroo

A baby kangaroo peers out from the marsupial pouch of its mother at Sofia Zoo.

Ancient kangaroo didn't hop

A female Kangoroo and her baby near Brisbane. A 25-million-year-old fossil has revealed that a predecessor of Australia's iconic hopping kangaroo once galloped on all fours, had dog-like fangs and possibly climbed trees.