Risk of extinction
Endemic species are geographically constrained to one particular place on the planet. They often live on islands, though humanity has pushed more than a handful of continent-based animals to an endemic state through hunting and habitat loss. Endemic species are more likely to form in biologically isolated areas such as islands and large bodies of water. Endemic species run a higher risk of extinction because of their geographic isolation.
This story has been updated with new information since it was originally published in January 2010.