Jumping spiders are agre3ssive little buggers: as active rather than passive hunters, these hunters jump by means of specialized internal hydraulics, like little Gangstamobiles, causing their legs to extend forcefully and rapidly, propelling them into the air and across long distances. Characteristically, a jumping spider creeps towards its prey, crouches, inches its forelegs towards its target, and… (GULP!) pounces, covering distances as great as 30cm (one foot, and 15x its own body length). See figure B, below.
* NB: this installment of B.V. is dedicated to Lowly_Adjunct (aka. K.E.); oh you who perversly loves spiders, enjoy– this one’s for you.