The Hammerhead's Bet

Why would evolution build a shark with eyes on the ends of a flattened, T-shaped head?

The wide head sets its eyes far apart, giving it a broad field of view and better depth perception than a narrow-snouted shark. Researchers also think the head spreads its electric-field pores across a wider span, like sweeping a metal detector instead of holding it in one spot, though that benefit is harder to prove.

The trade-off is more drag while swimming, a cost evolution clearly judged worth paying.

But the electric sense has a hard limit: it works only up close, within a few feet. A shark still needs smell, hearing, and its lateral line to close that final gap before the pores can take over.

Even so, nothing humans have built rivals it. No camera, sonar, or night-vision gear matches this sixth sense in murky, lightless water, where a hammerhead can pin down a fish it has no way of seeing.