What is the common, whimsical name given to the tough, protective egg cases laid by some shark and ray species?
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Often washed up on beaches, these leathery pouches are called mermaid's purses. They contain a single developing shark embryo and are equipped with tendrils that help anchor them to seaweed or the ocean floor. While many sharks give birth to live young, about 30 percent of shark species lay these unique cases. Photo: Xtylee, Wikimedia Commons, CC BY 3.0.
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Source: Wikipedia (CC BY-SA)
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