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 ...

You can see the live snail inside the shell. It’s white, says the National Park Service. The the yellow patch is a hard anatomical structure used like a trap door,. to protect the snail after it pulls ...