Fig. 1
From: Parental incubation exchange in a territorial bird species involves sex-specific signalling
Vocalization in relation to the time prior the end of incubation bout. Bars represent 30 s periods before leaving the nest (departure) and depict the probability that female (a; red) or male (b; blue) vocalized at least once within a period. The left-most bars (> 15) depict probability of vocalization (mean value per 30 s periods) more than 15 min before the departure. Note that Y-axis range differs between the sexes. Presented data include complete 24-day incubation footages for 40 nests. Ten of these nests are a part of the dataset presented in this paper while other 30 nests used in this figure were collected using the same method in the same area in 2015