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Long‐distance migrations are among the most physically demanding feats animals perform. Understanding the potential costs and benefits of such behaviour is a fundamental question in ecology and evolution. A hypothetical cost of migration should be outweighed by higher productivity and/or higher annual survival, but few studies on migratory species have been able to directly quantify patterns of...
Corvids (crows, jays, magpies and nutcrackers) are important dispersers of large‐seeded plants. Studies on captive or supplemented birds suggest that they flexibly adjust their scatter‐hoarding behaviour to the context of social dynamics and relative seed availability. Because many corvid‐dispersed trees show high annual variation in seed production, context‐dependent foraging can have strong effects...
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