In the modern era, two species have emerged from population bottlenecks to spread all across the planet. The first of these, of course, is man, which transforms everything it touches, destroying natural habitats and replacing them with farms and villages and cities.
Far less heralded and no less common is Pidgey. Although their sand attack suggests a desert origin, perhaps nesting atop cacti, today they live in grasslands and forests, along roads and atop skyscrapers. They do not breed especially quickly by pokemon standards, nor are they experts in resilience; many a trainer has expressed annoyance with running into them all the time, finding them to be anything but a challenge. But they possess keen eyes for hunting, strength in numbers, can digest a wide palette of food and have the intelligence to make or find nests anywhere. And unlike Rattata, who stow away on ships and discover islands only when humans do, Pidgey can fly atop mountains and over forests to find new lands to colonize. This has wreaked havoc on ecosystems, driving out the local birds like a weed except for the nocturnal the fierce Staravia; even in Kanto Spearow have become quite rare as Pidgey continue to multiply, and competition from Pidgey has at least as much to do as overhunting with the endangered status of Farfetch'd.
Today Pidgey is common all across the pokemon world, with the notable exception of Hoenn, which has preserved its remarkable biodiversity first by distance, and now by shooting wild Pidgey on sight.
