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"Spikes placed on buildings to deter birds are being used by birds to build nests in several locations around Europe....
Birds often use thorny branches as nest material, sometimes placing them as a roof to ward off predators and protect their young. In cities, however, there is a lack of prickly branches around, so a few birds have turned to anti-bird spikes."
https://www.newscientist.com/article/2382030-birds-are-using-anti-bird-spikes-to-make-their-nests/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=news #Birds