Bird Problem In Boston

(This was sent by a faithful reader and it ties in perfectly with the previous post.  Thanks, faithful reader!)
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Researchers at the Massachusetts Turnpike Authority found over 200 dead crows on highways in the greater Boston area recently, and there was concern that they may have died from Avian Flu.

Bird Pathologists examined the remains of all the crows, and, to everyone's relief, confirmed the problem was definitely not Avian Flu.

The cause of death appeared to be vehicular impacts.

During the detailed analysis it was noted that varying colors of paints appeared on the bird's beaks and talons.  By analyzing the paint residues, it was determined that 91% of the crows had been killed by impact with a truck, while only 9% were killed by an impact with a car.

MTA then hired an Ornithological Behaviorist to determine the reason for the disproportionate percentage of truck kills versus car kills.

The Ornithological Behaviorist offered the following explanation:  When crows eat road kill, they always have a look-out crow in a nearby tree to warn of impending danger. They discovered that while all the lookout crows could shout "Cah!", not a single one could shout "Truck!"