leaf: originates from the Proto-Germanic word *lauba (leaves), maybe from Proto-Indo-European *leub(h), meaning "to peel off/ to strip". Man, these puns just write themselves, don't they
Chimpanzees Use Leaves as Hygiene Tools
Wild chimpanzees have been observed chewing leaves to clean themselves and treat wounds—a behavior once thought uniquely human and a sign of basic health care in animals