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A dye packet? Good idea! The dye packet will release a smoky dye, making it difficult for the shark to see the seal. But the shark isn't called the "perfect predator" for nothing! Its other senses are called into action. By sensing the water movement as the seal swims and by detecting the seal's electric field, the shark will still be able to find the seal. Try again. Cocos Island | Sharkmasters | World of Sharks | Dispatches E-mail | Resources | Site Map | Sharks Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule | About NOVA Watch NOVAs online | Teachers | Site Map | Shop | Search | To Print PBS Online | NOVA Online | WGBH © | Updated June 2002 |