For the study, unattended acoustic recording devices were placed at a Nightjar study site in Nottinghamshire sampling vocalisations of the birds at two points in the breeding season. The results show that European Nightjars’ song types vary through the breeding season and this method may prove to be a minimally intrusive means of identifying numbers of Nightjar breeding pairs as opposed to just singing males.
Get access to the full (paid-for) paper online: https://www.tandfonline.com/doi/abs/
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