Columbia subject headings:
Animal intelligence.
Brain.
Psychobiology.
Psychology, Comparative.
Vertebrates--Nervous system.
Harvard subject headings:
Animal intelligence.
Brain.
Intellect.
Nervous system--Vertebrates.
Vertebrates--Physiology
Princeton subject headings:
Animal intelligence.
Brain.
Psychobiology.
Psychology, Comparative.
Vertebrates--Nervous system.