Billions of birds are making their way around the world right now as part of their annual spring migration.But climate change, habitat loss, and human infrastructure are making that journey harder for a lot of species.That's why conservation and government groups come together twice a year to celebrate World Migratory Bird Day – but maybe they also just want an excuse to talk about our feathered friends.Either way, we're happy to oblige.Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Connect with us. Listen to 1A sponsor-free by signing up for 1A+ at plus.npr.org/the1a.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy