Venomous Fiends update (Placeholder name)

The Venomous Fiends (Placeholder name) update would bring a variety of new and venomous creatures to the many places of minecraft. Rattlesnakes for the desert, new spiders in the forests, poison frogs in the jungle, and spiney fish in the ocean depths. These venomous critters would increase the value of milk, and potentially bring a new item, the milk bottle. This could also bring a new achievement. By giving a bottle of milk to  villager, you are rewarded with the "Milkman" achievement. These bottles of milk could work like a full bucket of milk, or give a reduced effect for poison and potions.