Corvids are smart.

https://www.audubon.org/news/apparently-magpies-and-crows-are-using-anti-bird-spikes-make-their-nests#:~:text=But%20for%20the%20magpies%2C%20there,spikes%20are%20for%20nest%20defense.%22

#Magpies #Crows #BirdSpikes