Some birds are using antibird spikes to build their nests

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The spikes were meant to keep birds away. But five corvid nests in Europe use the bird-deterrents as structural support and to ward off predators.

Rebellious crows make nests out of anti-perching spikes

National Geographic - In an example of “the perfect revenge,” Eurasian magpies are ripping anti-bird barbs off buildings and using them to build armored nurseries for their chicks.

Birds get revenge by using anti-bird spikes in nests

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PDF) Bird nests made from anti-bird spikes

Birds Using Anti-Bird Spikes to Build Nests

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Bird-X 24 ft. Original Commercial Grade Stainless Steel Bird Spikes STS-24 - The Home Depot

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European Birds Have Been Using Anti-Bird Spikes To Make Nests

Bird-X Stainless Steel Bird Spikes - 2.5-in x 100-ft STS-100

They're Outsmarting Us': Birds Build Nests from Anti-Bird Spikes - The New York Times