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.

The golden snub-nosed monkey from the mountains of Western China is one of the monkeys in the world that live in the socially most advanced societies. They congregate in troops of up to more than 400 strong and each member knows many of the other individuals. This takes a lot of brainpower – the golden monkey has the biggest brain of all the colobine monkeys – plus spending many hours watching each other. Like this young male is doing, sticking his tongue out and having a focused look on his face. Qinling Mountains, Shaanxi.