A killer whale in the Salish Sea is observed harassing a porpoise, a behavior that has long perplexed scientists. A study from Wild Orca and UC Davis' SeaDoc Society investigate what may be behind it.

But while playing catch with a dead porpoise could be a form of play ... to form even larger groups of over 100 orcas. A female killer whale gives birth to one calf at a time every three to ...

A few months earlier, researchers reported the first instance of a lone killer whale hunting and eating ... instances of orcas harassing and killing porpoises without actually consuming them.

Marine experts say there could be many reasons why porpoises have died on the Northumberland coast Killer whale v shark: Solo orca eats great white A solitary killer whale, or orca, has been ...