Columbia subject headings:
Birds--Behavior.
Birds--Ecology.
Birds--Evolution.
Mammals--Behavior.
Mammals--Ecology.
Mammals--Evolution.
Social behavior in animals.
Social evolution.
Harvard subject headings:
Birds--Behavior.
Birds--Ecology.
Birds--Evolution.
Mammals--Behavior
Mammals--Ecology
Mammals--Evolution
Social behavior in animals.
Social evolution in animals.
Social evolution.
Princeton subject headings:
Birds--Behavior.
Birds--Ecology.
Birds--Evolution.
Mammals--Behavior.
Mammals--Ecology.
Mammals--Evolution.
Social behavior in animals.
Social evolution.