These are 5 of Australia's deadliest extinct animals. Ranging from giant komodo dragons to a marsupial lion, the thylacoleo, these animals are crazy. OnX: Get a 1 month free trial here: Forrest Galante is a world renowned wildlife biologist and TV Host. His mission is to inspire and educate people about animals and adventure through the media, including hosting programs on Discovery Channel, on-camera expert interviews, and production of his own wildlife and natural history shows. Join this channel to get access to perks: Like and Subscribe! Let me know what type of content you’d like to see next!