Monster Hammerheads: Killer Instinct

Dr. Tristan Guttridge believes hammerhead sharks can reach monster sizes by hunting other sharks -- but the only way to prove it is to get tissue samples from some of the largest sharks on t... Read allDr. Tristan Guttridge believes hammerhead sharks can reach monster sizes by hunting other sharks -- but the only way to prove it is to get tissue samples from some of the largest sharks on the planet.Dr. Tristan Guttridge believes hammerhead sharks can reach monster sizes by hunting other sharks -- but the only way to prove it is to get tissue samples from some of the largest sharks on the planet.