OCEAN SUNFISH (MOLA MOLA)

Although not endemic to Australia, these strange creatures can be seen swimming around the southern shores of the continent. Sunfish are the heaviest known bony fish on Earth, with one species, Mola alexandrini, reaching a whopping 2,300 kilograms in weight. What’s most notable about these fish are their incredibly large dorsal and anal fins, making them over four metres tall. These ocean giants deep dive into very cold waters to feed on zooplankton and avoid predators. To warm themselves back up they move close to the surface to bask in the Sun’s heat.