If you’ve seen a squirrel up close before or spotted one gnawing on an acorn, you’ve likely witnessed their razor-sharp teeth in action. Squirrels require their front teeth to gnaw on hard food like ...

As this happens, new teeth grow to replace those that have been worn down. In this way, a snail’s mouthparts are continually regenerated. In snails ranging in volume from the size of an acorn to the ...