Actually I believe the
main purpose of venom is immobilization. Not all venoms cause necrosis of the tissues or start the digestion process. Some just flat out parilyze, and quickly in some cases.
Most Hemotoxic venom is known for the necrosis it causes, (Digestion aide if you will) But a lot of neurotoxic venom is known for quick immobilization, with out the appearant necrosis (or very little), involved with Hemotoxins.
At least, this is what I have been taught.
But aside from all that..........."Humans venomous to poatoes" HA HA HA HA I like that.
Ciao,
Rick