In Asia, the most densely populated continent, animals have developed extraordinary ways to seize the opportunities of the human world. From tigers entering a city to hunt easy prey, to elephants stopping traffic to demand food from motorists.A small park in central Bangkok supports 300 giant lizards, whilst a flying squirrel in Taipei has made a cosy home in a school. Yet the changing human world creates unprecedented challenges – proboscis monkeys are forced to venture uncomfortably closer to humans, and swifts in Jerusalem face tough competition for nest sites.