By A Mystery Man Writer
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 birds use anti-bird spikes to build their nests •
Bird control spike - Wikipedia
They're Outsmarting Us': Birds Build Nests from Anti-Bird Spikes - The New York Times
Another reason why crows are cool: they make nests out of anti-bird spikes - Boing Boing
Outsmarted man: crows use anti-bird spikes to protect their nests (6 photos) » Nevsedoma
What Really Scares Birds Away? Expert Bird Control Tips
Choosing the Right Type of Bird Spikes for Your Building - Bird B
Rebellious crows make nests out of anti-perching spikes
Bird Control Spike Installation Services at best price in Pune
Bird-X 10 ft. Original Extra-Wide Stainless Steel Bird Spikes Bird Control EWS-10 - The Home Depot
European Birds Have Been Using Anti-Bird Spikes To Make Nests
Crows and magpies using anti-bird spikes to build nests, researchers find, Animal behaviour