Spring is Advancing Unevenly Across North America (3 of 3) (image) PLOS Share Print E-Mail Caption The blue-winged warbler (Vermivora cyanoptera). Credit Bettina Arrigoni, Flickr Usage Restrictions CC-BY - Redistribution allowed with credit. Share Print E-Mail 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.