 This allows males to raise their abdomens, which may also be capable of being flattened and waved from side to side, thus emphasizing the appearance of the dorsal pattern.Not all species have colors that appear bright to human vision; "Maratus vespertilio" is relatively cryptically colored, with most iridescence on the lateral flaps.The abdominal display is used in courtship and, in at least one species, also in aggressive interactions with rival males.