Fig. 2. During aerial-hawking attacks on intact C. tenera, the call period (ms) for two echolocation calls immediately preceding the first click (period 1) and the period for two echolocation calls immediately after the first click (period 3) were shorter in duration than the period for two calls between which the first click fell (period 2). Period represents the time from the beginning of call x to the beginning of call x+1. Values are means ± S.E.M.