Rescue workers and volunteers saved six orcas that became stranded on a beach in Argentina's beach town of Mar Chiquita on Monday. /VCG Photo

After spotting seven stranded orcas on the beach, residents called the authorities and worked to return two smaller orcas to the sea. /VCG Photo

A team of around 40 people, including firefighters, lifeguards and marine biologists, came to help and eventually managed to pull another four back to the water. The remaining one died. /VCG Photo

Authorities told the Associated Press that they were not sure why the orcas had beached themselves and planned an autopsy on the dead orca to discover the reason. /VCG Photo