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 ...

The oddball minority of animals that don’t lay eggs includes a tough little snail called a rough periwinkle. Unlike mammals giving birth to kittens and fawns and helpless little humans, this ...