Columbia subject headings:
Apes--Behavior.
Mammals--Behavior.
Monkeys--Behavior.
Social behavior in animals.
Harvard subject headings:
Apes--Behavior
Mammals--Behavior
Monkeys--Behavior
Social behavior in animals.
Princeton subject headings:
Apes--Behavior.
Mammals--Behavior.
Monkeys--Behavior.
Social behavior in animals.