blog postsWhen warblers warn of cowbirds, blackbirds get the messageMar 31, 2020 9:00 am by Diana YatesResearchShare on FacebookTweetEmailImagesResearchers at Illinois report that red-winged blackbirds respond to the yellow warbler's 'seet' call as if they know that it means a cowbird - a notorious brood parasite - is near.Share on FacebookTweetEmail