Why birds beautify their nests with bizarre and unnatural items

Birds might beautify nests with synthetic items and feathers to discourage magpies and ravens from taking their eggs.

Many birds had been seen putting human-made items of their nests, equivalent to plastic, wires and even anti-bird spikes from constructions. Often, these items appear to have no position as insulation or structural toughen, and might make nests extra conspicuous to predators.

Magne Husby at Nord University and Tore Slagsvold on the University of…