Things can get downright deadly when male kangaroos fight over mating rights. With their gigantic feet, these "boomers" deliver kicks that can crush bone... and even kill their opponents. Images from the show "World's Deadliest".

Known as the world's largest marsupial, kangaroos are one of Australia's most iconic species. They are also one of the biggest mammals to hop as their primary way of travelling. Find out how these animals use their tails to get around, take care of their joeys, socialise as a group, and more.

This newborn tree kangaroo is a sign of hope for the species. It was born in early 2018 at the Healesville Sanctuary in Victoria, Australia. It has just poked its head out from its mother’s pouch for the first time. The joey is a Goodfellow’s tree kangaroo, one of more than a dozen species of tree kangaroo. The species is considered endangered by the International Union for the Conservation of Nature. Unlike their ground-hopping counterparts, Goodfellow's tree kangaroos are not nimble on the ground. However, they are agile in the treetops. This Goodfellow’s tree kangaroo birth is the first one at the Healesville Sanctuary. The sanctuary is operated by the conservation organisation, Zoos Victoria. Zoos Victoria is a non-profit organisation committed to fighting wildlife extinction.

Here's how a caregiver to orphan kangaroos has been able to replicate the security of mom’s pouch with the clever use of a pillowcasee, enabling orphaned babes to feel more like at home. 

Meet Brian, an eastern bettong from Australia, which is essentially a mini-kangaroo and is not very well known. Brian is shining a spotlight on these pocket-size marsupials.

Watch these two Kangaroos fighting with each other.