The Bornean Bay Cat (Catopuma badia) is one of the world's beautiful "small cats." It's also, after a photograph in 2003, unseen, endangered, and possibly extinct.
As Loren Coleman reports here, only twelve specimens have ever been collected, and the first live specimen was not caught until 1992. There are none in captivity now. But just-released photographs have confirmed the cat is, at least, alive. Hopefully they will give a boost to conservation efforts.