Blackbirds have fallen dead from the sky in Beebe, Arkansas, for the second New Year's Eve in a row.
Television station KATV showed a radar image that it said showed a large mass over Beebe a few hours before midnight on Saturday.
The Little Rock station reported that hundreds of birds had died.
Beebe animal control worker Hearst Taylor told KATV the reason for the bird deaths is not known yet.
Last year, fireworks were blamed for the deaths of thousands of birds. It was not immediately clear if year-end celebrations are again to blame.
Beebe police imposed an impromptu fireworks ban on the night.
Biologists said last year's kill was caused by the birds being rousted from their roosts and flying into homes, cars, telephone poles and each other.