You probably don't think of snails as dangerous whether they live on the ground or under the sea, but cone snails all carry venom that is injected with a harpoon-like tooth that punctures its prey before paralyzing it. Most small cone snails are no more dangerous than a bee, but the larger versions and some more venomous varieties can kill a human. There is still no antivenin for cone snails and the larger ones can even puncture through protective gloves. Symptoms of a bite include pain, swelling, numbness, vomiting, muscle paralysis, changes in vision and respiratory failure that can result in death.
