The fossil of a 13-million-year-old giant sperm whale, which fed on other whales, has been found in a a coastal desert in Peru.

While modern-day sperm whales have teeth only in their lower jaws, and suck down squid like large spaghetti noodles rather than catch the prey with their teeth, the "much-toothier" fossil sperm whales, however, may have eaten more like a outsized-orca, or killer whale, chomping great big bites out of its prey, Discovery News reported.