From the National Audubon Society Magazine
“A year ago, a Golden Eagle approaching the Glenrock/Rolling Hills wind farm in Wyoming might have seen a dangerous optical illusion: A turbine’s blades, spinning at more than 150 miles per hour, would appear not as solid objects to be avoided, but as a blur the bird could fly through. Scientists believe this disorienting visual phenomenon, known as motion smear, contributes to the collisions that kill an estimated 140,000 to 679,000 birds per year at wind farms in the United States. The same eagle soaring over the area’s scrubby sagebrush today will see warning signs. Those once indistinct and innocuous-seeming blurs will present clearly as physical masses, signaling to birds that they should steer clear.” |
