Most people would think that shark are crazy, insane "killing machine" but in actual facts recent studies have indicated that many species possess powerful problem solving skills, social skills and curiosity. I guess you wouldn't believe this, sharks' brain- to body-mass ratios of sharks are similar to mammals and birds. One of the examples of the intelligence is that a group of up to seven great white sharks worked together to move a partially beached dead whale to deeper waters to feed. Sharks too, like dolphins can engage in playful activities. Porbeagle sharks have been seen repeatedly rolling in kelp and chasing an individual who trailed a piece of kelp behind it.
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