For most of us, dragging the bins out to the kerb every week is a fine example of domestic drudgery. But for cockatoos gazing down from the trees, the sight of wheelie bins can mean meal time.

The weekly battle for the contents of wheelie bins has escalated in recent years, with clever cockatoos and householders locked in an "arms race" over rubbish raids. Sulphur-crested cockatoos learn ...