The segments are twice segued with fantastic map animations. As if rolling in on the wing of a plane we zip into the map from above, cartoon ships putt-putt across the oceans and an occasional dolphin illustration breaks the surface of the sea. The film could have used a couple three more such glossy transitions. An actual clip of film shot on a tuna ship is included. Their eyes move independently.
Dolphins use echolocation to pinpoint hiding fishes under the sand.
Depicted as a sort of heat x-ray, this is nicely explained in the visual also. Dolphins are practically the only other species besides us that call each other by name. But, anyway, smart or not, dolphins certainly seem like they'd make very good friends. I quite enjoyed the humans swimming a dance with the dolphins. The ocean-going leaps of small herds of dolphins also captivated me.