1. Armen, Jean Claude. 1976. Gazelle Boy: A Child Brought up by Gazelles in the Sahara Desert. London: Picador.
2. Baptista, Luis F., and Martin L. Morton. 1981. “Interspecific Song Acquisition by a White-crowned Sparrow.” Auk 98:383–385.
3. Beer, Colin G. 1982. “Conceptual Issues in the Study of Communication.” In Acoustic Communication in Birds, edited by Donald E. Kroodsma and Edward H. Miller, 279–310. New York: Academic Press.
4. Bekoff, Marc. 2008. The Emotional Lives of Animals: A Leading Scientist Explores Animal Joy, Sorrow, and Empathy—and Why They Matter. Novato, CA: New World Library.
5. Bender, Courtney E., Denise L. Herzing, and David F. Bjorklund. 2008. “Evidence of Teaching in Atlantic Spotted Dolphins (Stenella frontalis) by Mother Dolphins Foraging in the Presence of Their Calves.” Animal Cognition 12(1):43–53.