What do you think it is?

If during a vacation, walking along the beach, you find this strange thing, don’t be alarmed. This is just a marine life, washed ashore by a wave. More precisely, this is an egg that is laid by some species of sharks and stingrays. They are also called "mermaid wallets." Taking it in your hand, you will find that it is very light and quite soft, it feels like skin. But at the same time, its shell is quite durable and consists of collagen. As a rule, "wallets" are already empty, but also those in which there is an embryo are found.

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