Figure 4.

Distribution of Different Sand Perturbation Events

A human observer manually classified 14,234 video clips into one of ten categories. Bower events are scoops, spits, or multiple scoop/spit events associated with bower construction. Feeding events are scoops, spits, or multiple scoop/spit events associated with feeding behaviors. Spawning events involve male fish quivering to attract females. Other events include sand perturbations caused by fins or the body, reflections of events in the aquarium glass, or sand dropped from above.