https://www.straitstimes.com/singap...at-marina-rivals-again-in-kallang-basin-clash "Both sides eventually emerged from the clash without casualties, and the Marina family retreated to its home in Upper Peirce Reservoir. The Marina otters are known as such as they initially established themselves in the Marina Bay area, while the Bishan otters resided in the Bishan area. But around 2015, a territorial dispute resulted in them swapping homes. So the Marina otters now live in the central catchment area and the Bishan otters now call the Marina and Kallang area home."
The article did not load for me. I wish it had, I genuinely can't tell from the summary whether it's about gangs calling themselves otters or actual otters.