An unlikely mammal has made its home in the busy Singapore metropolis. Otters were once on the verge of extinction here due to the side effects of rapid industrialization in the 1970's. But with the restoration of the environment since, some experts believe otters from nearby Malaysia recently spurred a welcome comeback. We follow 2 families as they navigate the city's waterways and challenges. But beware: these cute little creatures are fiercely territorial and don't take kindly to intrusions!