Cities look like the end of wild nature, but this film argues they are becoming a new kind of habitat with their own evolutionary pressures. Researchers track how pigeons, foxes, and insects change behavior and even body shape to exploit concrete, steel, and constant artificial light, and how plants push through pavement cracks and colonize rooftops and abandoned lots. Scientists in the field and lab explain urban evolution as a distinct branch of study, comparing populations of the same species inside and outside city limits to measure genetic and behavioral divergence happening over just a few decades. The film visits streets, parks, and waterways where this adaptation is visible, from birds that have altered their calls to be heard over traffic noise to animals that have shifted their sleep schedules around human activity. Rather than treating urban sprawl as simple habitat destruction, the film builds a case that cities themselves are functioning as accelerated laboratories for natural selection.