Well, this is not a pretty story.... about 200 dead crows were found near Halifax, and there was grave concern for Avian Flu.
They had a Bird Pathologist examine the remains of all the crows, and 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, and only 2% were killed by car impact.
The Province then hired a Ornithological Behaviourist to determine the disproportionate percentages for truck versus car kill.
The Ornithological Behaviourist determined the cause in short order.
When crows eat road kill, they always post a "look-out Crow" in a nearby tree, to warn of impending danger.
His conclusion was that the lookout crow could say "Cah".....but he could not say "Truck."