Species of birds responding to the “barrier effect” of rivers in the Madeira drainage, Amazonian Brazil, as documented by Fernandes et al., in this volume. Top left: Immature male Common Scale-backed Antbird Willisornis poecilinotus (photo by Anselmo d’Affonseca); top center: Thrush-like Mourner Schiffornis turdina (photo by Alexander C. Lees); top right: Wedge-billed Woodcreeper Glyphorynchus spirurus (photo by Anselmo d’Affonseca). Below: View of the Aripuanã River by sunset (photo by Alexandre Fernandes).
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