Feral cars express suppressed wild traits after a few generations, for example a rough gray hide to blend in with the asphalt and concrete.
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They're slow but very agile (to fit into the little space the city offers them), and their insides are soft and excrete digestion enzymes.
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Nobody *quite* knows where the "glowing sideline" trait came from. But it's spreading, seems to confer a very distinctive mating advantage.