title: Ecological determinants of reinforcement in the guinea pig.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003216:Conditioning, Operant; D004032:Diet; D004435:Eating; D004463:Ecology; D004777:Environment; D005247:Feeding Behavior; D006168:Guinea Pigs / Q000502:physiology*; D008297:Male; D009042:Motivation; D051381:Rats; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D013045:Species Specificity