They might not look like it, but sea cucumbers are extremely valuable creatures. In fact, Business Insider reports just one kilo can cost over $3,000! And the rarer these animals become, the deeper divers have to swim to find them--sometimes risking their lives in the process. Sea cucumbers are typically dried and packaged in ornate boxes, then given as gifts and served on special occasions. So, the fancier and more unusual-looking, the better. Sea cucumber expert Steven Purcell says the rarest ones look like "some sort of mystical dragon slug with all sorts of spikes coming out of it."

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