1. How fecundity balances mortality in birds
2. ON CLUTCH-SIZE AND FITNESS
3. Greenberg, R. 1980. Demographic aspects oflong-distance migration. Pages 493-504 inA. Keast and E. S. Morton, eds. MigrantBirds in the Neotropics: Ecology, Behavior,Distribution and Conservation. Smithso-nian Institution Press, Washington, DC.GreenbergDemographic aspects of long-distance migration493Migrant Birds in the Neotropics: Ecology, Behavior, Distribution and Conservation1980