In the San Francisco Bay Area, high-speed, high-volume traffic and seasonal migrations have created a maelstrom of animal-driver carnage. A motorcyclist was recently killed when he struck a large deer. A cyclist flying down a hill smacked into a deer and suffered a concussion and memory loss. The region ranks among the worst for wildlife-vehicle collisions in California, according to a report from UC Davis.

The number of drivers smashing into animals—deer are by far the most common victims, but t…