This piece was originally published in Undark and appears here as part of our Climate Desk Partnership. On March 12, an estimated 541,000 sandhill cranes were nestled along the Platte River Valley near Kearney, Nebraska. Nearby, hundreds of people huddled in riverside blinds with cameras and binoculars to watch as the birds stretched out their slender necks and showed off their red foreheads and penetrating orange eyes.