That evidence, and the fact that the red-winged blackbirds fly in close flocks, suggests they suffered some massive midair collision, he added. That lends weight to theories that they were startled by something.
Earlier Monday, the estimated number of dead birds was raised to between 4,000 and 5,000, up sharply from the initial estimate of 1,000.
Keith Stephens, a spokesman for the Arkansas Game and Fish Commission, provided the new numbers.
Residents of the small town of Beebe awoke Saturday to find thousands of dead blackbirds littering a 1.5-square-mile area. The birds inexplicably dropped dead, landing on homes, cars and lawns.
Violent weather rumbled over much of the state Friday, including a tornado that killed three people in Cincinnati, Ark. Lightning could have killed the birds directly or startled them to the point that they became confused. Hail also has been known to knock birds from the sky.