TIL: there are otter gangs in Singapore who fight for territories. It is well followed by the locals and the press. Each gangs has names and reputations.

https://mothership.sg/2020/03/bishan-marina-otters-fight/
https://www.reddit.com/r/todayilearned/comments/15bo5qj/til_there_are_otter_gangs_in_singapore_who_fight/