FTA: “Magpies may use the anti-bird spikes not just as ordinary nest material, but specific placement in the dome, overarching the nest, hints at functional use

FTA: “Magpies may use the anti-bird spikes not just as ordinary nest material, but specific placement in the dome, overarching the nest, hints at functional use. The anti-bird spikes may be used by birds in the same way as they were intended to be used by humans: to ward off (other) birds.”