Life: Fish

The focus turns to fish, the most diverse vertebrates on the planet, made up of more than 28,000 species. Off the coast of South Australia, sea dragons pair up for courtship, engaging in a mirror dance before the eggs are laid on the male's tail. Gobies climb up the vertical rocks of Hawaiian waterfalls to access secluded pools at the summit, and flying fish use their elongated pectoral fins to escape from predators. Narrated by David Attenborough