A silverback soaks in a swamp for hours while munching herb roots.
Mondika, Democratic Republic of the Congo.
IAN NICHOLS/National Geographic Creative
A chameleon reaches for a snack.
Moka, Mauritius, Africa.
Lips gummy from bambu fruit, a mother cradles her young.
A chimp at a termite mound fishing with a probe and puncturing stick.
Nouabale Ndoki National Park, Republic of the Congo.
Western lowland gorilla hierarchy plays out in the treetops.
Booming hoots and rapid-fire chest beats announce a patriarch.
Two young chimpanzees play in the canopy of a fig tree.
A young chimp resting high in the forest canopy.
A gorilla knuckle-walks on arms as thick as tree limbs.
Ian Nichols visits his father, Michael "Nick" Nichols, on assignment.
Republic of the Congo.
MICHAEL NICHOLS/National Geographic Creative
As rain falls, a chimp adds to the calls ringing through the forest.
A termite nest on the Congo's rain forest floor.
Playtime for a pair of juvenile western lowland gorillas.
The break of dawn at Mbeli Bai.
A chimp resting high in the forest canopy.
A chimp in Goualougo Triangle's rain forest canopy.
A male chimp with a young chimpanzee carcass around his neck.
Portrait of a juvenile female western lowland gorilla.
Chimpanzees resting high in the forest canopy.
A large spider on web in the Congo's rain forest.
In pursuit of honey, a chimpanzee works to smash open a beehive.
After morning feeding, sated chimps socialize in the canopy.
A noisy charge through the jungle may be to intimidate nearby rivals.
Mushrooms grow on a log in the Congo's rain forest.
A young chimp is groomed by his mother.
A small party of chimps triggers a remote video camera.
With her infant clinging to her belly, a chimp climbs a fig-tree.
Chimpanzee habitat and rain forest canopy in the Goualougo Triangle.
A young ape plays at the edge of a swamp.
A forest buffalo in Mbeli Bai.
A blue duiker in the Congo's rain forest.
An elephant in the Goualougo Triangle in Nouabale Ndoki National Park.
An elephant stops to eat fruit on the forest floor.
An elephant stomps on fruit in order to eat the pulp and seeds.
An elephant cools off in the water at Mbeli Bai.
A male western lowland gorilla sits alone in the jungle.
A primatologist sits in camp before dinner.
A young gorilla in Mbeli Bai.
An African forest turtle rests among some leaves on the forest floor.
At an above ground termite mound, a chimp triggers a remote camera.
Chimpanzees climb an above ground termite mound.
A primatologist performs a necropsy on a dead gorilla.
A caterpillar on the Congo's rain forest floor.
A male chimp in Nouabale Ndoki National Park's Goualougo Triangle.
A motion-triggered camera caught this leopard preying on chimpanzees.
Scientists set up remote camera traps to capture chimpanzees.
A bird nest with eggs in a small sapling in the forest.
A mushroom on a tree houses a strange animal.
A frog perches on a tree branch in camp.
An insect mimicking a leaf in the Congo's rain forest.
Bees on top of an odd mushroom on the Congo's rain forest floor.
Forest pigs eat fruit at a camera trap site.
A young chimp from a nearby community hoots at the researchers.
A small snake rests on some leaves in the Congo's rain forest.
A young male chimp strips bark to eat in the rain forest canopy.
An insect on a dead leaf on the Congo's rain forest floor.
A flower in the Congo's rain forest.
A leaf in the Congo's rain forest.
A chimp eating fruit high in the forest canopy.
Tourists at Mbeli Bai watch the elephants.
A tree snake on a young sapling in the Congo's rain forest.
A black mangabey sits in a tree during the hot part of the day.
A snail traverses a log on the forest floor.
A yellow backed duiker in the Congo's rain forest.
A forest guineafowl in the Congo's rain forest.
A chimpanzee's fringed fishing probe used to collect termites.
A gorilla peers through the forest in Nouabale Ndoki National Park.
A cockroach on a leaf in the Congo's rain forest.
A gaboon viper resting in the sun on the Congo's rain forest floor.
A tree covered with protective spiked thorns.
An alpha male chimpanzee in Goualougo Triangle's rain forest.
An elderly female chimpanzee in Goualougo Triangle's rain forest.
A male chimp hoots in excitement over a fruiting tree.
A female chimp in estrus eats figs in the canopy.
A elderly female chimpanzee in Goualougo Triangle's rain forest.
A large snail on a small sapling in the Congo's rain forest.
Fungi growing on the Congo's rain forest.
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