🚨 When is peak bird migration in your city? 🚨 @cornellbirds BirdCast analyzed radar data to find when 50% of nocturnal migration passes through each city. ➡Peak spring migration varies by location - check the data to see yours! ➡Turning off lights on peak nights helps prevent bird collisions. ➡For real conservation impact, treat your windows with Feather Friendly markers and reduce collisions year-round by over 95%! Find your city's peak dates & take action! More details here: birdcast.info/news/peak-spring-bird-migration-periods-u-s-cities BirdCast map provided by @cornellbirds and @coloradostateuniversity #BirdMigration #LightsOut #FeatherFriendly #USFWS #cornelllabofornithology #springmigration #migration #lightout #treatglasssavebirds