With no sightings in two years, the rare Ogasawara blue butterfly, named after its island chain natural habitat far south of Tokyo and designated a national natural treasure, is considered extinct ...

The rare Mount Charleston blue butterfly lives in just a handful of alpine meadows on Mount Charleston above Las Vegas. The species was protected under the Endangered Species Act in 2013. One of its ...

The Xerces blue butterfly went extinct along the San Francisco coast some 80 years ago. But scientists have identified a ...