Scientists disagree on whether the 2.5-million-year-old Black Skull should be called Paranthropus aethiopicus or Australopithecus aethiopicus. Image: Nrkpan/Wikicommons Paleoanthropologists Alan ...

Because black rhinos browse instead of graze, the hooked lip helps them munch on leaves from trees and bushes. In addition, white rhinos have a longer skull, a less defined forehead and a more ...