They are the emblem of the town. The black swans are also more aggressive to humans than their white cousins after that could pose a threat en route for agriculture by grazing and fouling grasses and eating crops.
Kindling Island: Aggressive Birds It is possible that these birds could become well-established as they did when they were introduced en route for New Zealand. The black swans are also more aggressive en route for humans than their white cousins and could pose a danger to agriculture by grazing after that fouling grasses and eating crops. It set up home along with the other residents which are all white mute swans. Below the act, it is an offence to release or accept the escape of this class into the wild. This swannery is a sanctuary and not a zoo so birds be able to come and go as they please.