1. Sneering and defiance Publication: Bethesda, MD : U.S. National Library of Medicine, National Institutes of Health, Health & Human Services, 2009 Subject(s): Aggression -- physiologyEmotions -- physiologyFacial Expression
2. Means of expression in animals Publication: Bethesda, MD : U.S. National Library of Medicine, National Institutes of Health, Health & Human Services, 2009 Subject(s): Birds -- physiologyBehavior, AnimalAggression -- physiologyEmotions -- physiology