Black Swan in Lake Rotorua

Black swans are floating on the lake.
Beautiful and noble black swans are breeding
unusually due to the food which tourists give.
Black swan's numbers are increasing too much
and they damage wheat.
Local people started to kill the black swans.
We humans as tourists give them food because
we like to see them,
and then we kill them because they eat our crops.
Who thinks we can decide fate of the black
swans?
I am so sorry, swan...
2000/7/12@Rotorua New Zealand