Colombian woolly monkey (Lagothrix lugens)
Range: Columbia and possibly Venezuela
Colombian woolly monkeys greet each other by kissing each other on the mouth and embracing. These critically endangered monkeys live in groups of 10 to 45 individuals, which peacefully share their territory with other troops. They are arboreal and use their powerful, prehensile tails to suspend their large bodies from branches (and sometimes as an extra hand). Woolly monkey infants, nursed by their mothers for as many as 20 months, can cling to their mother's fur immediately after birth. When they’ve matured, young female monkeys leave home to join a male in another troop, while young males stay in their birthplace.

Researchers have found that woolly monkey populations decline one year after El Niño events, which affect food availability for these fruit-eaters. Researchers have warned that the intensification of El Niño events due to climate change may further endanger this vulnerable primate.