National Geographic : 2010 Jun
• Youngsters grown up enough to migrate 2,500 miles to Texas still beg for crabs and clams from an adult probing brackish water at Aransas. Nearly a century into conservation efforts, including long-term monitoring of banded birds (right), whoopers have taken a big step back from the edge. But only with healthy habitat across their range can the wild flock persevere. Says biologist Tom Stehn, "There's just no wiggle room with this species."