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While many sharks hunt for small, abundant prey when looking for a meal, great hammerheads have a supersized strategy with some big payoffs—eat other sharks.

For a long time, scientists have observed great hammerheads hunting other sharks, including blacktips during their seasonal migrations off Florida. But the energetic benefits of this high-risk, high-reward strategy were unclear until now.

The models predicted that a 250-pound great hammerhead would only need to consume one 55-pound blacktip shark roughly every three weeks to meet its energy demands. This single large meal could sustain the hammerhead for up to two months during periods when blacktip shark populations are scarce. In stark contrast, if the hammerhead were to rely on smaller reef-associated fish, it would need to catch one or two 2.2-pound fish every single day to sustain itself.