Blackpoll Warbler Wearing Tiny 'Backpack' (IMAGE) University of Guelph Caption Blackpoll warbler wearing tiny 'backpack.' Credit Vermont Centres for EcoStudies Usage Restrictions None License Licensed content 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.