Some birds are using antibird spikes to build their nests

How to Stop Birds from Nesting on Your House - Bird Spike Control

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Are bird spikes safe for birds? Why or why not? - Quora

Experiments hint at why bird nests are so sturdy

Helping Nesting Birds in the UK, Wildlife, bird nest

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

Bird Nest Tree Images – Browse 146,042 Stock Photos, Vectors, and Video, bird nest

Bird Nest Tree Images – Browse 146,042 Stock Photos, Vectors, and Video, bird nest

Why these Crows are using Anti-bird Spikes to Build their Nests