Humans are but chromosomes away from their monkey cousins, and these pensive portraits of chimpanzees, orangutans, baboons and bonobos show just how similar the species really are.
British wildlife photographers Anup Shah and Fiona Rogers have spent the past year travelling the world to capture stunning images of some of the planet's most elusive primates.
Though their subjects are rare it's clear to see why they are considered to be our closest cousins. Their collection of pictures captures apes in the natural habitant, with their instinctive expressions laid bare.
From puzzled to playful, musing to mischievous, their startlingly human expressions reveal a capacity for emotion that rivals our own.
Whether a sleepy yawn, piquant grin or thoughtful muse, these candid images show that apes are undeniably 97% human.