Cities turn out to be evolution's fastest laboratory. This film follows biologists tracking how animals and plants rewrite their own DNA within decades, not millennia, to survive human sprawl. In France, catfish in an urban river have learned to lunge onto riverbanks and drag pigeons into the water, a hunting technique never seen in their species before. On a California university campus, researchers find female birds abruptly switching mating strategies. In New York's Central Park, mice have shifted their gut biology to process a diet of discarded human food. Killifish along the Atlantic coast have evolved genetic resistance to industrial chemical waste that would kill their rural relatives, and scientists studying moths ask whether nighttime light pollution is next to trigger adaptation. Genetic analysis anchors each case, letting biologists show the actual mutations behind the behavior rather than just describing it. The film's real argument is that noise, garbage, and concrete are not just obstacles for wildlife but raw material cities are actively evolving around.