Figure 3.

Diagram of the wave simulator used to test the responses of turtles to orbital movements associated with small ocean waves. A motor turned a belt, which rotated a wheel, in turn driving a second belt attached to two identical rotating aluminium arms. A vertical post attached to the arms moved a hatchling (suspended in a cloth harness at the bottom of the post) through a series of orbital movements. An infrared video camera mounted on the post was used to monitor the hatchling's turning behaviour when it was subjected to motion simulating waves approaching from the turtle's right (as shown) or left (adapted from [26]).