Crab spiders wait in ambush for passing insects; some hold their front legs outstretched in readiness. Their vision for movement is good. Their jaws are small, and after prey is bitten, it is held above the spider and sucked dry. Those that sit on flowers apparently have a toxin potent to bees, flies, and other insects much larger than themselves. They do not use silk to capture prey, but in courtship, the male may wrap his prospective mate loosely in silk.