Fig 5. Behavioural responses to artificial calls.

(A) During P1 element and CAB playbacks, individuals spent comparable proportions of time looking out (χ² ₁ = 0.2, p = 0.6), in movement (χ² ₁ = 1.8; p = 0.2), and looking at the nest (χ² ₁ = 0.5; p = 0.5). (B) Neither P1 nor CAB playbacks provoked an increase in nest-attentiveness over natural flight calls, leading to proportions of time spent looking at the nest during these trials being substantially lower than those generated during natural prompt calls (χ² ₃ = 25.4; p < 0.001). Figures show back-transformed predicted means (±SE) generated from GLMM analyses as outlined in Fig 3 (A) or in which the two-level factor was replaced with a four-level factor (B).