Columbia subject headings:
Animal rights.
Animals (Philosophy)
Animals--Social aspects.
Cognition in animals.
Human-animal relationships--Moral and ethical aspects.
Human-animal relationships.
Harvard subject headings:
Animal rights
Animals (Philosophy)
Animals--Social aspects.
Cognition in animals.
Human-animal relationships
Human-animal relationships--Moral and ethical aspects.
Princeton subject headings:
Animal rights.
Animals (Philosophy)
Animals--Social aspects.
Cognition in animals.
Human-animal relationships--Moral and ethical aspects.
Human-animal relationships.