I'd heard They found about a gazillion dead crows near my hometown of Holdrege, NE. and there was some concern that they may have died from some sort of Avian Flu.
They had a Bird Pathologist examine the remains and squeezin's of all the crows, and she confirmed the problem was definitely NOT Avian Flu, However, She determined that 97% of the crows had been killed by impact with trucks, and 3% were killed by an impact with a car.
Officials then hired an Ornithological Behaviorist to determine the possible reason for the disproportionate percentages for truck versus car kill...The O.B. determined the probable cause was merely when the flying rodents, I mean.. the crows found road kill, they always set-up a look-out Crow in a nearby tree to warn of impending danger.
His conclusion was that all the lookout crows could say "Cah"...but none could say "Truck."