Finch Nest with Cotton (image) University of Utah Caption This finch nest in the Galapagos Islands was built with cotton the bird collected from dispensers. A University of Utah study found that Darwin's finches on Ecuador's Galapagos Islands will collect cotton balls treated with a mild pesticide and then use them in their nests, resulting in the death of parasitic nest fly larva or maggots that kill finch nestlings and their mothers. The method might be used to protect birds and mammals afflicted by parasites. Credit Sarah Knutie, University of Utah Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.