The second of a six-part series of zoological exploration. The Sea of Cortez
The expedition lives on a tiny sun-baked desert island and explores the plants and animals that live in, on, or by the Sea of Cortez.
Rasa Island houses one of the world's most impressive sea-bird cities : it's the headquarters of the rare and graceful Heermann's gull. Finback whales plough up and down the coastline sieving plankton from the ocean - where feather-duster worms, octopuses and a myriad of other creatures make their living. The complex food chains are fascinatingly unravelled : we see the falcon that killed the gull that ate the lizard that caught the fly that fed off the fish caught by the skill of the osprey.
Film editor ANDREW NAYLOR Photography DOUGLAS FISHER
Producer JEFFERY BOSWALL. BBC Bristol