Cetaceans, the class of marine mammals including whales, porpoises and dolphins, are some of the smartest creatures on earth. Bottlenose dolphins, for example, have slightly bigger brains than humans (1600 grams versus 1300 grams), as well as developed highly complex language abilities. Some dolphins have even developed the use of tools, considered a marker of animal intelligence.
But sometimes dolphins do some pretty unintelligent stuff, at least from a human perspective. Specifically, some dolphins will beach themselves, getting stranded on sand in a way that often results in death. Entire pods of dolphins may end up doing this at once.
