Marine iguanas of the Galapagos Islands - diving for food Duration: 02:00 At dawn the cold-blooded marine iguanas are seen warming their bodies in the sun. The larger males are then seen diving into the surf, swimming up to 10 metres to the sea floor and grazing on red and green algae. A voiceover explains that they are only able to stay in the cold ocean for ten minutes. They are finally seen climbing back onto the rocky shore. This clip was first created on