Incredible rare footage shows a pod of orcas and sperm whales in a fraught battle. <br /><br />The large pod of orcas can be seen laying siege to a maternal pod of sperm whales, possibly to steal prey. <br /><br />A whale-watching vessel filmed the extremely rare event on March 24 in the Bremer Canyon, 70km off the coast from Bremer Bay, Western Australia, Australia. <br />
