Walking sharks

Yes, you read that correctly. Australia (of course it's Australia) has something like 9 species of shark that can walk on their lower fins and survive low oxygen water conditions. Apparently they evolved this to hunt hunt in the tide pools of reefs.

They are small sharks, only about 3 feet long, so they aren't a danger to humans. Give them another few million years and that might change.

Now if you are creating a fantasy world for a book or a game, things could be much more "interesting". Say Great White Sharks that can sneak up on people camping on the beach.

And that could lead to "land sharks" and the like.