Add Yahoo as a preferred source to see more of our stories on Google. An endangered Southern Resident Killer Whale, an icon of the Pacific Northwest, breaches near Henry Island in Washington State.© ...

(CNN) — A pod of Pacific white-sided dolphins off the coast of British Columbia have been observed cooperating with orcas, a traditional enemy that’s better known for taking out great white sharks ...

Orcas have a sophisticated language to communicate, with populations in different parts of world even speaking in 'dialects' which can be mapped out ...