A buzz of clicks and gleeful victory squeals compose the soundtrack in our first ever footage from the perspective of dolphins freely hunting off the coast of North America.
The camera-strapped dolphins caught more than 200 fish, including bass, croakers, halibut, smelt and pipefish. The smelt often flung themselves into the air in desperate attempts to escape the skilful predators.
But the dolphins tracked their every move, swimming upside down to give their swiveling eyes a clear view – a technique also observed previously in wild dolphins.."At distance, the dolphins always used echolocation to find fish. Up close, vision and echolocation appeared to be used together." The cameras also recorded the sound of the animals' hearts as they pumped hard to keep up with the strenuous activities, and revealed that rather than ramming their victims down, the dolphins instead used suction to help gulp down their still struggling prey with impressively strong throat muscles.
The dolphins mostly sucked fish in from the sides of their open mouths, throat muscles expanded and tongue withdrawn out of the way. The expanded inner mouth space helps create negative pressure that their sucking muscles add to.
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