Thanks to this thread I have the urge to restart one of my towns with a single animal type in mind. Personally I would either go with cubs or deer. At least for a time, then I’d probably want to switch to a less popular animal so my town would be more unique. Possibly the little birds like piper.
Besides the ducks,frogs,pigs and mostly koalas I already have,I'd start a chicken town.Next to the pigs I think they're the funniest species in the game.