In 2010, researchers studying the feeding habits of sperm whales…

In 2010, researchers studying the feeding habits of sperm whales collected a “pocket shark,” a rare species of tiny shark that has only been seen once before. The new specimen was a juvenile male just over 5 inches long—small enough to fit in your pocket. But the species name actually comes from a “pocket” gland above its pectoral fin that scientist believe is used to produce or excrete pheromones.

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