VIDEO: Swimming with a giant

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Coming face to face accidentally with this creature in the open ocean could certainly cause panic, but an enormous ocean sunfish that divers spotted off Portugal is completely harmless.

The underwater scene makes for a hypnotic video clip as several divers swim alongside the odd-looking fish, also known as a mola. It has an average adult weight ranging from 550 to 2,200 pounds.

The species, the heaviest of all bony fish, is native to tropical and temperate waters around the globe. Jellyfish are its preferred choice of food.

Adult sunfish are vulnerable to few predators, but sea lions, killer whales and sharks will consume them. Humans consider sunfish a delicacy in Japan, Korea and Taiwan.

Mola are frequently seen basking in the sun near the surface and are often mistaken for sharks when their huge dorsal fins emerge above the water.

Their teeth are fused into a beak-like structure, and they are unable to fully close their relatively small mouths, according to National Geographic.