New Zealand was isolated from the rest of the world for a long time. It split from Australia 83 million years ago. Because of this, there are many plants and animals that only live in New Zealand. Before humans came to New Zealand, there were no mammals, except three species of bat and marine mammals such as seals, dolphins, and whales. Instead, New Zealand has many different kinds of bird. New Zealand has several species of flightless bird, including the kiwi and Kakapo. For the lizards, especially important is the Tuatara, the only living member of a whole order of reptiles.