A photo of the Humpback inventive technique known as “bubble net feeding,” taken at Alaska's Inside Passage (near Juneau). This is a form of co-operative feeding behavior. The humpbacks dive beneath a school of fish and encircle them in a “net” of bubbles that the fish won’t swim through. The whales then swim up through the bubble net, surfacing with their mouths open and their throats engorged with fish, which they swallow in one gulp.