The animals of New Zealand, part of its biota, have a particularly interesting history because, before the arrival of humans, less than 900 years ago, the country was mostly free of mammals, except those that could swim there (seals, sea lions, and, off-shore, whales) or fly there (bats), though as recently as the Miocene there was the terrestrial Saint Bathans Mammal, implying that mammals were present since the island broke away from other landmasses.