Generally, a shell is an evolutionary trait that allows a creature to retreat from predators. This is the case for almost all snails. But at least two species of snails use their shell in a much more active form of defense—knocking the crap out of predators.
This is not a photograph of a reptile's skin. Can you figure out what it is?
I've never seen a snail moving this fast in my life, but then I've never been to New Zealand where these creatures come from. The snails had to adapt to their isolation and became bigger and carnivorous.
Have you ever seen a snail look so happy? This Achatina fulica, an East African land snail, stretches its head toward a pleasant stream of tap water. You'd think it was washing a long, hard day off its foot.
As far as invertebrates go, you don't get much smarter than the members of the mollusk phylum, which includes octopuses, cuttlefish, and squid. But mollusks apparently didn't think through their evolutionary path very well, developing brains four times over.
Fashion is a fickle beast, but it gets strange when putting snail slime on your face becomes a thing. Come again? Apparently, snail goo is being marketed in such places as South America and South Korea as the best thing for your skin.
For most of us, being devoured by something many times bigger than us would mean a gruesome, agonizing death. But for tiny snails, it's just a minor irritation...and a quick and disgustingly clever way to migrate elsewhere.
A tiny sea snail known as the clusterwink snail has one of the strangest abilities in the animal kingdom. The snail can create a ghostly green light, then use its shell to scatter the light beam all over its shell.
Good news for homosexual male snails living off the coast of Western Australia, as the female sex of the Thais Orbita species have all grown rather large "members" on their heads. Sadly, the head-peni have formed due to chemical reactions.