The third episode of the BBC’s Blue Planet II spectacularly described a series of fascinating interactions between species on some of the most pristine reefs in the world. These reefs, analogous to bustling cities, are powered by sunlight, and provide space and services for a wealth of marine life.
Competition is rife, as exemplified by the ferocious jaws of the metre-long bobbit worm, ready to pounce on unsuspecting fish by night from its lair in the sand, or the pulsating show of colours of the cuttlefish as it stalks a mesmerised crab. Other reef species team up in