Researchers have found a new way to precisely measure the vortices -- circular patterns of rotating air -- created by birds' wings during flight. The results shed greater light on how these creatures produce enough lift to fly.
Reduced seasonal flooding of wetlands and farm fields in California's Sacramento Valley threatens a key stopover site for migratory shorebirds, a new study shows. Landsat satellite images reveal that flooded habitat is most limited during peak spring migration when the birds urgently need resting and feeding sites. Near the peak of migration, an area of […]