Linked from
The 17 pages that link to Spider venom, each with the reason it gives.
SpiderRelated: Venom helps many spiders immobilize prey and begin its external digestion.
Spider predationRelated: Venom helps immobilize prey and begin its digestion.
ProsomaRelated: The prosoma bears the chelicerae that inject venom into prey.
TarantulaRelated: Tarantula venom helps subdue prey, though its effects on people vary by species.
AraneomorphaeRelated: Many araneomorphs use venom injected through the fangs to subdue prey.
MesothelaeRelated: Venom helps mesotheles immobilize prey after a burrow-side strike.