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.

Proboscis monkey (Nasalis larvatus): Proboscis monkey bachelor with a perfectly peaceful expression on his face. The proboscis monkey is a large primate endemic to the island of Borneo. It is named after the long, hanging nose present in males and spends most of its time living in the trees near mangrove forests or jungle streams. It is also known as the long-nosed monkey and locally as the bekantan. Due to the threat of deforestation in its tropical rainforest habitat, populations of the species are in decline and it is listed as Endangered on the IUCN Red List.