In honor of Earth Day, Disney releases a documentary with a porpoise. It also has sharks, whales, seals and an amazing array of underwater vertebrates and invertebrates of much lesser size, too.

As the company’s nature division did with the film “Earth” last year at this time, today’s “Oceans” captures the majestic beauty of the planet and the recognizable humanity of our nonhuman fellow residents here. Why? The porpoise and the purpose? It obviously exists to raise our awareness the next time we litter or slather tartar sauce on a fried critter that might have been cruelly harvested.