Figure 2.

(a) Vision experiment. Total number of bird individuals choosing first the setup (a cylinder) in which they could see a systemically herbivore‐induced Scots pine branch (black bar, n = 33) or a cylinder with a control branch inside (white bar, n = 15) (**p = .0094), and (b) the same data separately for each study day. (c) Olfaction experiment. Total number of bird individuals choosing first the setup (a cylinder) with a systemically herbivore‐induced Scots pine branch (black bar, n = 26) or a cylinder with a control branch inside (white bar, n = 12) (*p = .024), and (d) the same data separately for each study day