Some birds are using antibird spikes to build their nests

pigeons building a nest on anti-bird spikes : r/birding

Your Guide to Getting Rid of Birds Nests - Covenant Wildlife

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Helping Nesting Birds in the UK, Wildlife, bird nest

Crows and magpies are using anti-bird spikes to build their nests, study finds

Crows and magpies are using anti-bird spikes to build nests, researchers find

How to Get Rid of Nesting Birds on Your Home - Bird B Gone LLC

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Snobs mocked for installing 'anti-bird' spikes on trees

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Magpie's Nest — menacing egg, menacing egg