 In intraspecific encounters, the effect of raising the forelegs is to bring the other spider to an abrupt halt, whether it be a wandering conspecific, a courting male preparing to touch the female, or a female stalking or about to jump at the male.Indeed, raising of the forelegs appears to have this 'stop-sign' effect even in encounters between congenerics of the three "Phidippus" species.Drees, working with female Salticus scenicus, was able to initiate hunting behavior by moving a black dot along a white wall, and to stop the pursuing spider by moving wires projecting from the side of the model through an angle that imitated the waving of the forelegs.