Cover legend: Stylized images obtained from a video sequence of a locust jumping in response to the simulated approach of a black disk on a white background. The analysis of such high-speed video recordings revealed that take-off occurs at a fixed delay after the object reaches a fixed angular threshold size on the animal's retina. Recordings from an identified neuron in the locust CNS allowed relating various phases of the jump with the activity phases of the neuron. For more information, see the article by Fotowat et al. in this issue (pages 10047–10059).