A team of researchers has officially reclassified the Javan rhinoceros, one of the world’s rarest and most elusive large mammals. Previously grouped under the same genus as the Indian rhinoceros, the ...

Sumatran Rhino: Native to Sumatra, Indonesia, this critically endangered rhino is staring at extinction due to habitat loss and poaching. Vaquita: A tiny porpoise found only in Mexico's Gulf of ...