The CDC and environmentalists were worried about all the dead crows they were finding on the highways around Boston.  They ruled out Avian Flu when they found that the birds had all been crushed – hit by vehicles.

With paint specks and other evidence they determined that all but a few were hit by trucks.  They called in a bird behaviorist to figure what was happening.  She discovered that the scavenger crows, who eat roadkill, always have a scout in a nearby tree to warn of oncoming traffic.

The problem was that crows in Boston can say “Caw, Caw,” but they can’t say “Truck.”

Thanks, Tim!