Rhino horns have become shorter in past century, study finds

Researchers say change could be result of selection pressures as human hunters preferred to target animals with larger horns

Rhinoceros horns have become shorter over the last century, researchers have found, adding the development could be a result of hunters and poachers targeting larger prizes.

Rhino horns were much sought after among hunters over the centuries, while modern poachers sell them for use in traditional medicines in China and Vietnam.