Table 1. The definitions of abnormal behavior categories for chimpanzees used in this study.

Coprophagy	Ingestion of feces
Hair pluck	Pulling out hair on self or another
Rock	Repetitive and sustained swaying movement without piloerection
Regurgitation & Reingestion	The deliberate regurgitation of food and subsequent consumption of the food
Self-injurious behavior	Biting, picking, or scratching at own body to cause injury
Pacing	Locomoting repetitively along the same path with no clear objective
Other	Any other behavior deemed abnormal, space to describe