1. Altmann, J. (1979). Age cohorts as paternal sibships.Behav. Ecol. Sociobiol. 6: 161–164.
2. Appleby, M. C. (1983). Competition in a red deer stag social group: Rank, age and relatedness of opponents.Anim. Behav. 31: 913–918.
3. Bain, D. E. (1989). Dispersal patterns in birds and mammals—insights gained from a nondispersing species, the killer whale (Orcinus orca). Poster presented at the 8th Biennial Conference on the Biology of Marine Mammals, Pacific Grove (CA).
4. Balcomb, K. C. and Bigg, M. A. (1986). Population biology of the three resident killer whale pods in Puget Sound and off southern Vancouver Island. in Kirkevold, B., and Lockard, J. S., (eds.),Behavioral Biology of Killer Whales, Alan R. Liss, New York, pp. 85–95.
5. Bertram, B. C. R. (1976). Kin selection in lions and in evolution. in Bateson, P. P. G., and Hinde, R. A., (eds.),Growing Points in Ethology, Cambridge University Press, Cambridge, pp. 281–301.