UK_Grasshopper_warbler_Steve_Willis (IMAGE) Durham University Caption Grasshopper warblers spend the summer breeding in Europe, but then migrate to sub-Saharan Africa for the winter. As their populations have declined hugely in recent decades they have been designated as a Red List Species in the UK. Credit Stephen Willis 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.