Some dolphins appear to have orca friends. Scientists think they have figured out what’s going on

Scientists say dolphins and orcas have teamed up to hunt salmon off British Columbia. It’s the first time such behavior has been documented between the two mammals.
The New York Times

Killer Whales Find an ‘Unlikely Friend’ in Dolphins

Off the coast of British Columbia, dolphins lead killer whales to salmon and earn their share of lunch, a new study reveals. A new study is the first to document cooperative hunting between orcas and ...