Orangutans have a unique vocalization called the "long call." It's a loud, resonant call that can carry for long distances, allowing them to communicate with other orangutans in the forest.
Orangutans are excellent climbers and can spend their entire lives in the trees. They build nests out of branches and leaves to sleep in, which they change every night.
Orangutans are incredibly intelligent. They have been observed using tools, such as sticks, to extract insects from tree bark or as umbrellas to shield themselves from rain.
Orangutans are the largest tree-dwelling mammals in the world. Their long arms and strong grip help them swing effortlessly through the treetops.