Magpies and crows are using anti-bird spikes collected from buildings to build nests.
They discovered two examples of these nests in Rotterdam, the Netherlands. A crow's nest with at least 16 anti-bird spikes was found in a poplar tree in 2009, and an unfinished crow's nest in a weeping willow that was pruned in 2021.
Crows can use anti-bird spikes to construct nests, then magpies' ability to put them to their intended use is even more impressive. Magpie eggs and babies are a tasty snack for crows, who sometimes try to stop magpies from building these characteristic domed shapes on top of their nests.
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