Pooling research from numerous international partners, Audubon's Migratory Bird Initiative promises to paint the fullest picture yet of the awe-inspiring phenomenon.
Researchers today can follow birds' paths as they fly thousands of miles. But it wasn't always that way. Scroll through more than two centuries of advances in understanding this natural wonder.
A Global Account of Bird Migration - American Birding Association aba.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from aba.org Daily Mail and Mail on Sunday newspapers.
Songbirds You Can Hear at Night capeandislands.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from capeandislands.org Daily Mail and Mail on Sunday newspapers.