Constancy of generic identity in the years three to six.
D000367:Age Factors; D000818:Animals; D002415:Cats; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D004285:Dogs; D006801:Humans; D008297:Male; D011574:Psychoanalytic Theory; D011582:Psychological Theory; D011817:Rabbits; D014796:Visual Perception