Bird is the word. 🐦 Every spring, migratory birds fly from South and Central America to the continental U.S. A new NASA study showed that precisely when the birds arrive is influenced by large climate patterns originating thousands of miles away. Scientists analyzed 23 years of bird migration data from 143 National Oceanic and Atmospheric Administration (NOAA) radar stations across the U.S. They found that the eastern and western U.S. each have a distinct pattern of variability in bird arrival