Nightjars

This volume aims to aid the identification of the notoriously difficult group of birds, nightjars. It also covers frogmouths, potoos, owlet-nightjars and the oi... » 

This volume aims to aid the identification of the notoriously difficult group of birds, nightjars. It also covers frogmouths, potoos, owlet-nightjars and the oilbird. An audio CD with the voices of many species is to available separately. «