Social Behavior
A hand held young slender loris. Click image for larger version.
Slender lorises are solitary, nocturnal foragers who are active throughout the night. During the day, they sleep curled up in a ball in hollow trees or in the crook of a branch, bracing themselves by clutching nearby twigs with their spindly arms and delicate hands.
While generally solitary, slender lorises have been seen foraging with a mate. As in other loris species, males will not tolerate the presence of other males in their territory. Individuals communicate using urine scent marks, claiming territory or advertising their reproductive status to others.
If threatened, slender lorises usually freeze and remain motionless until the danger has passed. If this fails, they will stare at their attacker and growl while emitting an unpleasant odor from scent glands under their arms.