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This is scientific Americans 60 second science.

I'm Jason Goldman.

Deep in the inky depths of what's called the ocean's mesopelagic zone more than 500 meters

beneath the surface, the main source of light is not the sun, even during the day. Most of the light comes instead from bio-luminescent organisms,

creatures that produce their own light. It's in these dark depths

that Southern elephant seals love to feast on squids and fish.

So initially we wanted to know how elephant seals finds their prey in the dark.

Pauline Goulé from the University of St Andrews' Sea Mammal Research Unit.

Thanks to data logging technology, researchers have a fairly good handle on how far elephant seals

travel to feed and how long and how deep they dive.

But nobody really knew how they find their prey in the darkness.

Do they track the lights or is something else going on?

So we built a sensor that could pick up flashes produced by animals that were being

hunted by the elephants because we thought that elephant cells might be looking for that light to get a snack.

But it turned out that the fish actually used their bioluminescence to disorient seals after the seals began their attack.

The thing is, it seemed that the flashing prey were harder to catch than the non-flashing prey, which we found out by looking at the duration of the chase, which was longer for flashing prey. The fish flash was always admitted just after the seal launched an attack, making it a defensive reactive

maneuver to distract the seals. But at least one seal learned to turn that liability into a hunting strategy.

This seal, which appeared to be a master in catching this session prey because each time you try to catch a prey first it would do this little head movement that was

mechanically sensed by the prey then it would induce the prey to flash because the prey reacts to

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