I say tame, but it terrorises the other waterfowl. Mallards, Moorhens, Coots, even a Greylag Goose, all have been chased by this tiny, dainty croaking psychopath.
I’m not convinced it’s doing the right thing by its duckling though. Half the time while she is chasing off everything else in sight, the duckling is alone and vulnerable.
Still, it’s amusing to see a usually timid bird chase something as aggressive as a Coot clear out of the water.