What is the western magpie’s nest composed of?

Most birds build their nests of twigs, grass, feathers and bracken. Some prefer ready-made nest sites like tree holes, which they then line with a soft bedding material for the young chicks. The western magpie, however, a bird of Australia and New Zealand prefers to use rather more robust materials. It is particularly fond of pieces of metal, such as wire and tin. The nest of one western magpie was found to contain 6.3 kg (13 ¾ lb) of assorted pieces of wire. Placed end to end these bits and pieces extended to a length of 45 m (138ft)!