Photographer Captures Hilarious Close Up Portraits of Some of the World's Most Unusual Primates

For over two decades, photographer Mogens Trolle has captured stunning wildlife photos on all seven continents. Trained as a zoologist and wildlife biologist, he specializes in mammals and uses his knowledge of them—as well his keen eye—to capture each creature’s unique personality.

On Fire: Black-crested macaque male showing teeth. Despite the impressive canines the monkey feeds mostly on fruits and invertebrates. It lives in troops that can grow to more than 100 individuals. Sulawesi, Indonesia.