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from National Geographic Society (blogs)

Watch: Grouper Slurps Down A Shark, Not A Typical Meal

"The Atlantic goliath grouper (Epinephelus itajara) isn’t the meanest or fastest fish on the reef. It has neither venomous barbs nor impressive fangs. But as its name suggests, the goliath grouper does do at least one thing of note: It gets big. Darn big. And as the saying goes, big fish eat little fish." Whoa. Should we stay tuned for Grouper Week on Discovery?

Diver induces natural paralysis on a 10-foot shark by rubbing hundreds of jelly-filled pores around the animal’s nose and mouth. This state can last up to 15 minutes.