There are many spider predators around the world. Toads, frogs, lizards, centipedes, bees, birds, spiders are predatory, parasitic wasps and some parasitic eggs in the spider, and some parasitic fly larvae developing in spider egg bag, mosquito head almost all horsefly insect larvae to form a parasitic spider body. Spiders used a variety of methods to resist the enemy, such as discharge venom, concealment, camouflage, mimicry, camouflage, vibration and so on. When the escape, and their appendages were clamped when predators, simply cut off their own limbs to walk away, anyway, since the breaking of the walking legs will regenerate during molting.
Toads
reference: http://tupian.baike.com/a1_38_41_01300000669572127574418284365_jpg.html
Frogs
reference: http://tupian.baike.com/a2_61_62_01300000400875124688624418155_jpg.html
Lizards
reference: http://www.nipic.com/show/1/9/5288759k160dd1de.html
reference: http://www.nipic.com/show/1/41/f717b0d75ff20b14.html
reference: http://pic.wenwen.soso.com/p/20110802/20110802223949-1046760388.jpg