But halfway across the world, there's another type of snail that is just as popular. And it's called ốc, or "sea snails." In the streets of Vietnam, people have been eating them for centuries.

The cone snail uses consomatin to paralyze its prey. The toxin stops blood sugar levels from rising, which is fatal for fish.

Scientists watched as a population of sea snails evolved within just ... saxatilis is a common species of marine snail found ...