The Breeding Biology of the Brown Jay in Monteverde, Costa Rica

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Abstract
In an expanding population of brown jays (C. morio) in the Cordillera de Tilaran of Costa Rica, flocks exhibit a broad range of breeding behavior involving the construction of .gtoreq. 1 nests by .gtoreq. 2 birds, egg-laying, incubation and brooding at 1 nest by .gtoreq. 1 females, and nestling care by breeding and non-breeding birds. The form that breeding behavior takes may be related to the ages of flock members. Flocks vary considerably in age, and breeding success is correlated with the number of older birds. The variation in brown jay breeding behavior may provide some insight into the evolution of social organization in New World corvids.

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