Some species of butterflies can reach fast speeds, such as the southern dart, which can go as fast as . Sphingids are some of the fastest flying insects, some are capable of flying at over , having a wingspan of . In some species, sometimes a gliding component to their flight exists. Flight occurs either as hovering, or as forward or backward motion. In butterfly and moth species, such as hawk moths, hovering is important as they need to maintain a certain stability over flowers when feeding on the nectar.