Those cockatoos!

Roosting in the bush at the back of our place are a few sulphur-crested cockatoos. Their pastime? Twisting the new flowering heads off your viburnums, breaking the new stems of the Forsythias, heading for your neighbours' fruit and vegies. Etcetera etcetera. And you wouldn't mind (so much) if they got some valuable nourishment out of their labour, but mostly they seem to toss the flower,or whatever, away, and cackle on to the next toy.
Well, I s'pose in the scale of things it'not really that bad, just a tad aggrannoying!