Watch this nice snail. It slowly moves across the ocean floor—lah-di-lah-di-lah!—until it finds a sleeping fish three times its size. Does it say hello, Mr. Fish, sorry to wake you up? No. It just ...

There is one local snail that I would bet everyone who lives in coastal New England knows and loves: the common periwinkle. What young person hasn’t picked up a periwinkle from the beach and tried to ...