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.
Birds Using Anti-Bird Spikes to Build Nests
BORHOOD Bird Spikes for Outside, 40 Pack Bird Deterrent Spikes for Small Robin Pigeon Squirrel Raccoon Crow Cats Defender Spikes to Keep Birds Away and Keep Birds from Building Nest
All Around Town — Santa Clara Valley Audubon Society
They're Outsmarting Us': Birds Build Nests from Anti-Bird Spikes - The New York Times
How to install bird spikes on roof
How to Keep Birds (And Their Mess) Off Your Porch - Men's Journal
How Birds Are Using Anti-Bird Spikes to Build Their Nests
Shop By Problem – Pipes & Railings – Bird Barrier
How To Keep Birds From Building Nests With One Secret!
Why these Crows are using Anti-bird Spikes to Build their Nests
This Cunning Bird Creates a Fake Entrance to Its Nest to Trick Predators
Bird' spikes to build have BECOME UNGOVERNABLE anti- learned to use Birds have their nests Pic: Auke-Florian Hiemstra - iFunny
