Relative Fecundity and Parental Effort in Communally Nesting Anis, Crotophaga sulcirostris

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Science  22 Jul 1977:
Vol. 197, Issue 4301, pp. 403-405
DOI: 10.1126/science.197.4301.403


The contribution of eggs to the communal clutch by females of the group and the genetic contribution by males of the group are significantly skewed. The amount of parental care performed by each bird is correlated with relative egg ownership for both sexes.