Hair masses that great tits brought on the eggs within 24 hours after the playback treatments. Solid dots represent the mean masses of the hair that great tits brought on the eggs after the pied flycatcher and waxwing treatments in both areas together (pooled, n = 59), Oulu (n = 41) and Turku (n = 18), respectively. Bars represent confidence interval for the hair mass at a 95% confidence level. FC = Flycatcher, WW = Waxwing.
Loukola et al. BMC Evolutionary Biology 2014 14:32 doi:10.1186/1471-2148-14-32