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.

Rebellious crows make nests out of anti-perching spikes

WTF Fun Fact 13455 - Bird Nest Spikes

Outsmarted man: crows use anti-bird spikes to protect their nests (6 photos) » Nevsedoma

Bird control spike - Wikipedia

Birds have co-opted anti-bird spikes to build nests. Genius! - Vox

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

A recent journal article reports - for the first time - birds' use of anti-bird spikes in their nest construction — Steemit

How to Keep Birds (And Their Mess) Off Your Porch - Men's Journal

Bird-X 10 ft. Original Extra-Wide Stainless Steel Bird Spikes Bird Control EWS-10 - The Home Depot

Wealthy Bristol residents cause uproar by installing 'anti-bird spikes' to stop droppings hitting expensive cars, The Independent