The killer orca whales who will attack their own for the sake of a good meal

A mother grey whale moves through the blue waters of the Pacific Ocean, her calf at her side.

In the distance, a menacing pod of orcas heads intently towards them.

And then the bloodshed starts. These shocking images show how killer whales will stop at nothing to get their feed - even if it involves attacking their own kind.

The orcas, which weigh about six tons each and measure up to 26 feet, take it in turn to ram headfirst into the calf, almost knocking it out of the water.

Other killer whales leap on top of the young mammal, trying to drown it.

The brutal attack, which took place off the coast of California, in Monterey Bay, lasted an hour and a half before the orcas succeeded in killing the calf.