What squirrels in California grey? Evolution.
Buildings in California are made almost entirely of wood because of the earthquakes. Wood is more flexible than concrete, and not as expensive as steel. The voluminous demand of wood made the landscape more rocky and harder for red squirrels to camouflage in the surroundings. As a consequence, the squirrels in California evolved to a more grey color.
Needless to say, the above mentioned "theory" is hilarious.
However, certain details are true: buildings are made of wood and many faults run across California.
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