They found about 200 dead crows near Tahlequah, OK.
and there was concern that they may have died from Avian Flu.
They had a Bird Pathologist examine the remains of all the crows,
& he confirmed the problem was definitely NOT Avian Flu, to everyone's relief.
However, he determined that 98% of the crows had been killed by impact with trucks,
& only 2% were killed by an impact with a car.
Oklahoma then hired an Ornithological Behaviorist to determine
the disproportionate percentages for truck versus car kill.
The Ornithological Behaviorist determined the cause in short order.
When crows eat 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." ”
—Jeffrey Reich, WILDWOOD, Missouri