Blue Planet II

Creatures that live on coral reefs, including groupers, small predators that scientists believe are as intelligent as chimpanzees. These creatures have a remarkable aptitude for communication to the point where they can interact with other species including octopi and work together to catch prey. Plus, footage of a vast spawning event involving several different species of fish, coral and invertebrates, and time-lapse photography of coral polyps growing and dying, creating a structure visible from space.