extinction

Navaornis lived approximately 80 million years ago in what is now Brazil, before the mass extinction event that killed all non-avian dinosaurs.

In the early 1900s, the conservationist and anthropologist Madison Grant, who helped establish Glacier National Park and the Bronx Zoo, wrote pseudoscientific tomes about the coming extinction of white people.

White people are an endangered breed, fighting to delay their extinction.

A report this week found that 44% of corals living in warm waters are threatened with extinction, according to the International Union for the Conservation of Nature.

But some of the bird's unique evolutionary traits are clashing with human interventions, making it vulnerable to extinction.