A seaside snail crawling along the gooey streak left by another snail is saving a lot of energy, say researchers, because it doesn’t have to ooze so much slime itself. “It’s much, much more expensive ...

Snails have shells the moment they're born, but it's kind of hard to tell. In fact, it's hard to even see a baby snail. Some are nearly microscopic, such as Angustopila psammion, whose adult-sized ...