1. Australia has more than 378 mammal species, 828 bird species, 4000 fish species, 300 species of lizards, 140 snake species, two crocodile species and around 50 types of marine mammal.
2. More than 80 per cent of our plants, mammals, reptiles and frogs are unique to Australia 
3. Kangaroos and emus cannot walk backward, one of the reasons that they're on the Australian coat of arms ( Australia is one of the only countries where we eat the animals on our coat of arms).
4. There were over one million feral camels in outback Australia, until the government launched the $19m Feral Camel Management Program, which aims to keep the pest problem under control. 
5. Australia is home to the longest fence in the world. It is 5,614 km long, and was originally built to keep dingoes away from fertile land. 
6. Before the arrival of humans, Australia was home to megafauna: three metre tall kangaroos, seven metre long goannas, horse-sized ducks, and a marsupial lion the size of a leopard.
7. The male platypus has strong enough venom to kill a small dog. 
8. The dingo, or wild dog, is our largest carnivorous mammal. Other Australian carnivores are smaller than the size of an average house cat.
9. When the platypus was first sent to England, it was believed the Australians had played a joke by sewing the bill of a duck onto a rat.
10. Australia has 3.3x more sheep than people. 
11. Wombat poop is cube shaped! This helps it mark its territory.
12. Australia has more than 140 species of marsupials, including kangaroos, wallabies, koalas, and wombats.  55 different native species of kangaroos and wallabies.
13. Estimates of Australia’s kangaroo population vary between 30 and 60 million.
14. A kangaroo is only one centimetre long when it is born.
15. The Box jellyfish has killed more people in Australia than stonefish, sharks and crocodiles combined.
16. No native Australian animals have hooves
17. In 1932, the Australian military waged war on the emu population of Western Australia. Embarrassingly, they lost. 
18. There have been instances of wallabies getting high after breaking into opium crops, then running around and making what look like crop circles.
19. The male lyrebird, which is native to Australia, can mimic the calls of over 20 other birds. If that's not impressive enough, he can also perfectly imitate the sound of a camera, chainsaw and car alarm.
20.  There currently a chlamydia outbreak among koala species, which has led to a 15% drop in koala populations.