Columbia subject headings:
Mammals--Behavior.
Mammals--Food.
Mantled howler monkey--Behavior.
Mantled howler monkey--Food.
Harvard subject headings:
Howler monkeys--Behavior
Mammals--Behavior
Mantled howler monkey--Behavior.
Mantled howler monkey--Food.
Princeton subject headings:
Mammals--Behavior.
Mammals--Food.
Mantled howler monkey--Behavior.
Mantled howler monkey--Food.