the kangaroo island kangaroo, rosenberg's sand goanna, southern brown bandicoot, tammar wallaby, common brushtail possum, short-beaked echidna and new zealand fur seal are native to the island, as well as six bat and frog species. the sole endemic (found nowhere else) vertebrate species is a small marsupial carnivore called the kangaroo island dunnart. the koala, common ringtail possum and "platypus" have been introduced and still survive there. kangaroo island had a native species of emu, the kangaroo island emu which became extinct between 1802 and official european settlement in 1836. perhaps this was caused by bushfires or hunting by sealers or whalers.