A mangrove swallow Tachycineta albilinea sitting on its nest-box in the New River Lagoon, Hill Bank, Belize, in May 2008. Nest-boxes have allowed detailed studies of breeding biology in this genus from Alaska to Tierra del Fuego in the Golondrinas de las Americas network, and the paper by Winkler et al. in this edition of Ecography shows that the relationship between clutch size and lay date changes in regular and intriguing ways as one moves from the tropics pole-ward. Photo by David Winkler.

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