Painless killers: cone shells
Look but don’t touch.
It’s a useful piece of advice for anyone exploring the seas, especially in the tropics where there’s a good chance you’ll encounter some of the deadliest animals on the planet.
Cone snails produce amazingly complex venom. They load it into hollow teeth, like little harpoons, which they spit out at their prey. Some are powerful enough to kill an adult human. But scientists are discovering untold wonders in these toxins and unlocking a whole new realm of research and drug development.