Geoffroy's spider monkey (Ateles geoffroyi), also known as the black-handed spider monkey, is a highly agile primate native to the tropical forests of Central America and parts of northern South America. Known for their long limbs and prehensile tails, they are among the most acrobatic and arboreal primates, spending most of their time in the forest canopy.

These monkeys are large for New World primates, with body lengths ranging from 40 to 65 cm (16 to 26 inches) and a tail longer than the body at 70 to 90 cm (28 to 35 inches).

Their colouration varies by subspecies, but generally, they have black or dark brown limbs and a golden, reddish, or tan body. Some individuals may have darker patches on their faces, with a bare, black facial area.

Geoffroy's spider monkeys live in multi-male, multi-female groups of around 20 to 30 individuals, though group size can vary greatly depending on the habitat.

Newborns cling to their mother's belly for the first few months, then shift to riding on her back as they grow older. The mother takes sole responsibility for rearing the young, and infants remain dependent on their mother for about two years.

Geoffroy's spider monkeys are frugivores, with fruits making up around 80% of their diet. They play a crucial role in seed dispersal due to their fruit-heavy diet. They supplement their diet with leaves, flowers, seeds, and insects when fruit is scarce. Their reliance on fruits means they often travel long distances for food.