Around 100,000 fish have been found dead along a river in the US state of Arkansas, where thousands of blackbirds dropped dead from the sky on New Year's Eve
The fish - all of the same 'drum' species - littered the banks of a 20-mile stretch of the Arkansas River near Ozark, the Arkansas Game and Fish Commission (AGFC) said.
State wildlife officials are conducting tests to find out what killed them.
Keith Stephens, of the AGFC, said fish kills occur every year, but the magnitude of this one was unusual.
"The fish kill only affected one species of fish," he told CNN.
"If it was from a pollutant, it would have affected all of the fish, not just drum fish."
Meanwhile, officials are also investigating the mystery of up to 5,000 dead blackbirds in the town of Beebe, around 125 miles from where the fish were found.
The creatures began falling from the sky late on December 31 and continued into the next day, witnessses said.
"I came out here and saw a bird drop," said resident Stephen Bryant.
"It was horrible, you could not even get down the road without running over hundreds," another resident, Melissa Weatherly, said.
Beebe is a town of about 4,500 people located 30 miles northeast of the state capital, Little Rock.
Residents were not evacuated as a test of air quality found no toxins
Officials are looking at various possibilities as to why the birds dropped dead - including being startled by fireworks, stress or hit by hail or lightning.
Mr Stephens said: "It could be weather-related or possibly stress-related.
"There were some fireworks shot off at midnight and it is possible that the birds were on their roost and stressed so bad that it could have killed them."
High winds and tornadoes struck Arkansas on New Year's Eve, with the hardest hit area more than 150 miles to the west of Beebe.
The birds have been collected from rooftops, trees and yards and are being tested at facilities in Little Rock and Madison, Wisconsin
Earthquakes, Floods, Fires, unexplained dead animals...?
Ooh, Biblical...