[Does "altruism" exist in lower simians?].
D000339:Affect; D000818:Animals; D003216:Conditioning, Operant; D005247:Feeding Behavior; D005260:Female; D005502:Food; D000882:Haplorhini; D006613:Higher Nervous Activity; D008297:Male; D012930:Social Dominance
Est' li "al'truizm" u nizshikh obez'ian?