Check out what I found on the beach!

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I’d have left it on the beach. If you want you can put it in saltwater and see what happens, but it probably won’t make it very long outside of the ocean, especially if it already was out of water. It is likely dead at this point, in that case you can cut it open and see what is inside.
 
It is a horn shark egg!!! Should I cut it open? It seems there is something inside!

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If this is one of those "what's in the box" type competitions, i'm afraid you need to perfect your skills, you've already told us, lol.

On a more serious note though, as Hendre Hendre mentioned, you should have left it where it was if there's something inside. Chances are now, whatever it is, it'll be dead!!
 
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