Thomas Peschak's Image

Working on a climate change story, Thomas had secured a rare permit to land on Wolf Island, a remote part of the Galápagos Islands. Scrambling over loose rocks to reach this plateau, he spied a bizarre scene – pecking away at the flight feathers of a Nazca booby was a sharp-beaked ground finch. With scarce food alternatives, it had resorted to drinking blood to survive.

Encircled by steep cliffs, with no permanent water and little rainfall, Wolf Island is a difficult place to live. While the boobies can fish in the ocean, the finches are limited to a scant supply of seeds and insects. To survive they drink the blood of the Nazca boobies – a behaviour that may have evolved from feeding on parasites in their feathers