Then they bite their prey with poison, and wait for it to die. Next the spiders inject their prey with enzymes to dissolve the prey from the inside out. Then they slurp up the slimy remains. When spiders move they just pump blood into their legs. Then they remove blood from their front legs, which drags their back legs forward.
Spiders have special grip pads on the bottom of their feet.
Some spiders can run 330 times their body length in ten seconds, when humans can only run 50 times their body length in ten seconds. A spider's legs and feet make it agile and fast. Most spiders use silk to make webs to trap or drop on prey. Some eggsacs are also made of silk. The mother spider must protect her unborn children in the silken eggsac.