Instead, they’re mollusks, a group that also includes slugs, octopi, and squid. Are Snails Born With Their Shells? One of the greatest snail mysteries is its shell. Where does it come from?

A snail may have been saved from the “edge of extinction” after more than 1,300 born in a world-first breeding programme from the UK were released into the wild. The pea-sized Desertas Island ...