Tasmanian devils have been returned to the Australian mainland 3,000 years after the animals died off there. The mainland population is believed to have been partly killed off by a group of dingoes, wild dogs native to the continent. Experts say other causes of extinction could include a rise in the native human population and extremely dry weather. Tasmanian devils are meat-eating marsupials. Marsupials are mammals that reproduce differently from other animals. Most are born when they are just embryos and still developing. The baby animals take shelter for several months in a pouch on their mother’s body as they develop and grow. Two of Australia’s most common mammals, the kangaroo and the koala, are marsupials.