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''Phidippus audax'' is a common jumping spider of North America. It is commonly referred to as the daring jumping spider, or bold jumping spider. The average size of adults ranges from roughly in length. They are typically black with a pattern of spots and striped on their abdomen and legs. Often these spots are orange-tinted in juveniles, turning white as the spider matures. The spider belongs to the genus ''Phidippus'', a group of jumping spiders easily identified both by their relatively large size and their iridescent chelicerae. In the case of ''P. audax'', these chelicerae are a bright, metallic green or blue. These spiders have been known to jump from 10 to 50 times their own body length by suddenly increasing the blood pressure in the third or fourth pair of legs, and the male may jump away during mating if the female approaches too quickly. Like other jumping spiders, due to their large, forward-facing eyes, they have very good stereoscopic vision. This aids them when stalking prey, and allows some visual communication with others of their species, such as courting 'dances'. ==Habitat== Like most jumping spiders, ''P. audax'' tends to prefer relatively open areas to hunt in, as they actively seek and stalk prey and do not build webs to catch food. They do use webbing, however, when laying eggs or to hide. They also use spider silk as a 'lifeline' when jumping for prey or evading predators. They are common in fields and grasslands, but are frequently seen on fences, exterior walls, and gardens as well. Many jumping spiders seem to prefer flat vertical surfaces, likely due to the fact that it enables them to spot and chase down roaming insects with ease. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phidippus audax」の詳細全文を読む スポンサード リンク
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