1. Alerstam, T., and Högstedt, G., 1984, How important is clutch size dependent adult mortality? Oikos 43:253–254.
2. Anderson, M. G., 1984, Parental investment and pair-bond behavior among Canvasback Ducks (Aythya valisineria, Anatidae), Behav. Ecol. Sociobiol. 15:81–90.
3. Anderson, M. G., 1985, Variations on monogamy in Canvasbacks (Aythya valisineria), Ornithol. Monogr. 37:57–67.
4. Andersson, M., Wiklund, C. G., and Rundgren, H., 1980, Parental defence of offspring: A model and an example, Anim. Behav. 28:536–542.
5. Ar, A., and Yom-Tov, Y., 1978, The evolution of parental care in birds, Evolution. 32:655–668.