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Crows and Magpies Are Building Nests with Anti-Bird Spikes
A paper published this month in Deinsea highlights several examples of magpies and carrion crows building nests with strips of anti-bird spikes in both Rotterdam and Antwerp. Magpies are particularly enterprising and use pointed edges for their original purpose: many have lined the roofs of their homes with the spikes to deter predators from snatching eggs.
Respect to birds!