Bold jumper (Phidippus audax) is an extremely common jumping spider in eastern United States. It is a medium-sized spider but a very large jumping spider. It can be found from spring to fall in old fields, prairies, open woodlands, backyards, gardens, and human houses.
The most distinctive feature of this spider is the iridescent green or blue mouthparts. Both sexes share this feature, but when courting, the male will wave its forelegs and sense organs (palps), showing off his colorful parts.
Bold jumpers hunt during the day, not at night. They sneak up on their prey and pounce, releasing silk while jumping as a drag line to prevent falling. They will bite if molested but are usually too quick and wary to be caught. They can jump 10 to 50 times their body length.
There are about 5,000 species of jumping spiders. Bold jumper is distinguished by its large size; conspicuous, iridescent green or blue mouthparts; massive, high, front body segment with rounded sides; four pairs of matte black spots on the abdomen; the arrangement of usually four pairs of white spots on the abdomen; and its occurrence in the northern United States.