Some birds are using antibird spikes to build their nests

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 Repurposing 'Anti-Bird' Spikes to Build Nests, Researchers Say

A Rare Look Inside the Nests of Declining Prairie Songbirds Smithsonian's National Zoo and Conservation Biology Institute

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

Protect your Property with Anti-Roosting Bird Spikes

Anti birds spike hi-res stock photography and images - Alamy

Birds Utilize Trash To Build Nests, Reveals Study - Zenger News

HELPFUL & HUMANE - These bird off spikes work as a visual and physical deterrent, to keep large and small bird, pigeon, and other climbing animals

WELLUCK Bird Spikes for Small Birds Pigeons, 15 Feet /14 Strips Anti Bird Fence Spike, Nest Prevention Bird Off Spike Repellent, Stainless Steel

Bird spikes hi-res stock photography and images - Alamy

Anti Bird Spike System, Pigeon Spikes

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

How to build a magpie nest using anti-bird spikes - Quora

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

Everything You Need to Know About the Bird Nesting Season - The Blog Frog