Fig. 1

Overview of nurse shark interaction with bottlenose dolphins. The depth (color coded by vertical velocity), body pitch and tail beat period spectrogram (warm colors represent increased signal strength, white points represent estimates of tail beat period), before during and after interacting with the dolphins. Grey vertical shading represents time when dolphins were visible in the camera frame. Video frames were extracted (a–i) and show dolphins at the surface (a, d, h), descending (b, e) and on the bottom (c, f, g, i), with letters corresponding to the portion of the depth plot labeled with each letter. A dolphin can be observed crater feeding (c) and preparing to strike the shark with its caudal fluke (e)