An Imperial woodpecker hasn't been provably sighted since 1956, making it the holy grail for bird watchers in Mexico.

When a bird rarely seen on this continent showed up in Riverhead last month, the reaction was, as might be expected, a little cuckoo. Native to Eurasia, the bird is anything but common here: It ...

The list of animals pushed into extinction has grown even longer. In its latest update, the International Union for Conservation of Nature (IUCN) has officially declared several species extinct, ...