 When courting, the male Anna's hummingbird ascends some 35 meters before diving over an interested female at a speed of 27 m/s, equal to 385 body lengths/second, producing a high-pitched sound.This downward acceleration during a dive is the highest reported for any vertebrate undergoing a voluntary aerial maneuver; in addition to acceleration, the speed, relative to body length, is the highest known for any vertebrate.For instance, it is about twice the diving speed of peregrine falcons in pursuit of prey.