The open field: some comparative data.
D000367:Age Factors; D000818:Animals; D001522:Behavior, Animal; D002415:Cats; D002645:Chickens; D003672:Defecation; D004644:Emotions; D004777:Environment; D000882:Haplorhini; D006339:Heart Rate; D008722:Methods; D051379:Mice; D009043:Motor Activity; D051381:Rats; D013045:Species Specificity; D013997:Time Factors; D014828:Vocalization, Animal