By THÉRÈSE MARGOLIS      With less than 80 Sumatran rhinoceroses left in the wild, and only a few in captivity, the Sumatran rhino, the smallest of the five species of this endangered family of odd-toed ungulates, was officially declared extinct in Malaysia in 2015. The two-horned Asian rhino currently competes with the Javan rhino (of which there are about 100 left