Massachusetts offered a bounty on the gray seal until the 1960's, causing the population to plummet. But as officials established protections for the animals, these creatures have rebounded to incredible numbers. The reason for this explosion derives from a combination of no hunting pressure, an abundance of food, and a large migration from Canada. Residents claim seals have been devouring fish stocks, attracting sharks, and fouling beaches. Tourists may think the seals are cute, but they tend not to like 600 pounds of seal lounging next to them in the sand.