The common wombat is thought to be a descendant of the giant wombat that existed around 50 million years ago. The giant wombat's extinction is said to be caused by hunting and changes to their environment including pollution and habitat loss.
Wombats have long claws which they use to dig burrows. Wombat burrows can easily become an extensive network of underground tunnels leading to small chambers. Most wombats are solitary animals but some wombats have been known to form underground colonies with other wombats.
Wombats have a few natural predators including foxes and dingos. Although the wombat is relatively defenceless when it is out and about, wombats are generally well protected in their underground burrows as many predators cannot follow the wombat into the narrow, complex tunnels.
Today the wombat is considered to be an endangered species of animal. Wombat numbers have been decreasing rapidly due to habitat loss and hunting by humans who believe the wombat and it's network of underground tunnels to be an agricultural pest.