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What is this strange thing that I found on the beach, and what are the curved "horns" for?

Answer:

It is a skate egg case, also known as a Mermaid's Purse. Some sharks produce very similar egg cases. The horn-like hooks serve to attach the egg case to sea weed, but they also have openings that start out closed, making the egg case water tight. When the baby skate's gills develop, the the "horns" open to let salt water and oxygen in, so the baby skate can breath.
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