CNN: Some members of a group of Australian dolphins have been found to rip sea sponges from the ocean floor and use them to cover their snouts as they forage for food, apparently to protect themselves from stinging stonefish and other critters. And there’s evidence that the behavior is completely taught/learned, being passed from mother to daughter. This makes the behavior categorically different from instinctive forms of tool use among animals. Brilliant and wonderful. Go Dolphins!