Shavez Cheema, founder of 1StopBorneo Wildlife, described a moment when three different primates — the red leaf monkey, a gibbon, and the rarely seen Sabah gray leaf monkey — appeared together in one ...

With unmistakable coloring and a philosophical, at times almost melancholy expression, the Thomas’s leaf monkey (Presbytis thomasi) is one of Asia’s little-known primates. Thomas’s leaf monkey (also ...

BOSTON — A taste for reddish young leaves might have pushed howler monkeys toward full-spectrum color vision. The ability to tell red from green could have helped howlers pick out the more nutritious, ...