Marine biologist Karl Lundström, a researcher with Sweden's University of Gothenburg, recently published the results of a long-term study of the grey seals' diet. Like their human counterparts in Sweden, the seals are mostly eating herring, but they're also chomping on salmon and pretty much every other fish they can. They are, as Lundström put it, "fish-eating predators at the top of the marine ecosystem." And by "top," he means above humans. Though the Swedes have built fishing nets that are supposed to be humane and seal-proof, the seals turn out to be fairly ingenious at figuring out new ways to steal fish from them. As you can see in these videos, taken over the past several years, the seals do everything from jumping inside the nets and back out, to just ripping the crap out of them.