The ocean is full of wonders, but creating them has been a bloody battle for over half a billion years, as evermore complex animals fight for survival. They evolved new ways to hunt, overpower and kill and eat each other. And astonishing adaptations to defend themselves, hide and escape detection. Passing those amazing new abilities on to the next generation can be a bruising battle in itself as males fight each other for the right to mate.

Originally released by National Geographic, 2020. Streaming video file encoded with permission for digital streaming by Infobase on January 05, 2023.