Schematic representation of the experimental design. First, standard amount of sheep hair was added in the vicinity of the nest. Second, when tits had four eggs in the nest photo was taken from the nest in order to get raw baseline of clutch coverage rate. Third, all the hair that covered tit eggs and nest cup was removed/collected and photo was taken from the nest. Fourth, a playback in the proximity of the tit nest was carried out. The playback consisted of either pied flycatcher song and decoy, or a song and decoy of a wax wing. Playback lasted 5 minutes. Both playbacks were carried out following the same procedure in the same nest on consecutive days in random order. Fifth, response data (hair mass and coverage %) were collected 24 hours after the end of a playback.
Loukola et al. BMC Evolutionary Biology 2014 14:32 doi:10.1186/1471-2148-14-32