Figure 2. Western Bluebird provisioning rates the short-term playback experiment.

Western Bluebird provisioning rates under both ambient and noise conditions with a trial order of (A) ambient then noise conditions and (B) noise then ambient conditions. Individual female and male provisioning rates denoted by small red points and blue squares and connected with light solid or dashed lines, respectively. Large points and squares reflect mean provisioning rates per trial and sex. Vertical error bars on large points and squares reflect ± 1 s.e. Trial order strongly influenced provisioning behavior, such that provisioning rates were higher overall on second trials relative to first trials. (C) Marginal effect of time in seconds parents spent within 10 m on nestling provisioning rates.