Owls' dawn and dusk concerts promote visual communication

Reporting in the online, open-access journal PLoS ONE 8 April, Vincenzo Penteriani and Maria Delgado of the Estacion Biologica de Donana, Spain, describe the evolution of white throat badges in association with dawn and dusk vocal signals in certain species of nocturnal bird, which maximise the potential for these species to communicate during hours when light is low...

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