SaltwaterCrocodile Sales are the larGest prEdAtor in AUSTRALIA, and the most DANGERouS. A lifespan of 70 yeaRs on average lEngTh of 430-520cm speeD 3.2-4.8km (in water) and it eats a very lArge rang of aNimalS. the only animals that are dangers to crocs are cane tOads and humans.