Morphine withdrawal usually results in a decrease of taking in food. Real proof will come only from human trials. Another creature, called a Cone Snail , also produced interest among the scientific community as a source of pain relief. But once the fish comes close enough, the cone snail launches a miniature harpoon from the proboscis and uses it to inject a cocktail of poisons. The cone snail then emerges from the reef floor and devours its paralyzed prey.
Cone snails use their chemical overkill so that death comes as quickly as possible.
Any struggle would attract other predators, and the meandering cone snail is not about to run after a fish that is wounded but still mobile. What came out, after a painstaking process of milking the cone snails, and research showed a complex mixture of chemicals. Many of the chemicals had no effect when they were injected into mice. Studies proved that the chemicals that killed fish had an effect of stopping pain in humans. This prevents the nerve cells from releasing packets of nerve messengers to communicate with their neighbors.