Columbia subject headings:
Harvard subject headings:
Animal communication.
Language and languages--Origin
Language and languages--Physiological aspects
Neurobiology.
Primates--Behavior
Primates--Physiology
Princeton subject headings:
Animal communication.
Language and languages--Origin.
Language and languages--Physiological aspects.
Neurobiology.
Primates--Behavior.
Primates--Physiology.