The eye-like markings in some butterflies and moths and certain other insects, as well as birds like the sunbittern, serve functions in addition to mimicry; indeed, it is unclear whether they actually mimic eyes. There is evidence that eyespots in butterflies are antipredator adaptations, either in deimatic displays to intimidate predators, or to deflect attacks away from vital body parts. In species such as "Hipparchia semele", the conspicuous eyespots are hidden at rest to decrease detectability, and only exposed when they believe potential predators are nearby. Butterfly eyespots can mimic dead leaves for camouflage from predators, as seen in "Bicyclus anynana"; this is a response to a seasonal fall in temperature, causing a shift in selection towards smaller, less conspicuous eyespots among those individuals developing at that time. Butterfly eyespots may play a role in mate recognition and sexual selection. Sexual selection drives the diversification of eyespots in different species of butterflies, as mates select for characteristics like size and brightness.