He put a hotdog down a hole and caught crabs. That's the joke, but it's also what redditor dustbin3 did when he saw a large hole in his yard. This crustacean is a crayfish, also called a crawfish, crawdad, yard lobster, freshwater lobster, mudbug, yabby, and other names depending on where you live. They can be tasty with the right sauce. This one is, ahem, larger than average. Link
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