Perfect Shark - (BBC Earth)

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Sharks have been evolving for 400 million years - surely today these formidable creatures must be at the pinnacle of perfection? Eminent underwater wildlife cameraman and shark aficionado Mike deGruy comes face-to-face with some of the greatest sharks that ever lived, past and present. On his search for perfection, Mike encounters ancient sharks the length of a city bus, a shark that actually walks and various others with amazing qualities for survival. Is there one amongst them all that is the perfect shark, one that is or was so successful and versatile that it sticks out fin and tail above the rest?