Tuvalu 2017 $1 Australia's Remarkable Reptile Saltwater Crocodile 1oz Silver Coloured Proof CoinSaltwater Crocodiles are the largest reptiles on the planet. They are aggressive, territorial, and plentiful across the northern regions of Australia. Responsible for multiple attacks on humans and livestock, this prehistoric apex predator has developed a fearsome reputation as one of Australia's most dangerous animals.