Thinking about this too much, so just putting it here: a friend sent me this screenshot, saying "I don't know if this is fake news, but would be a great idea if real" and, yeah, that does look fake - those are AI-generated owls (this world, man).
But I was intrigued, and I know Swift Bricks are a thing, so I searched around, and what I found was loads of similar AI-generated clickbait about the same story, with 1000s of likes on social media etc, all basically the same thing, like this: https://www.youtube.com/shorts/jbpX2NlGUKw
Saving little owls, one clay roof tile at a time

YouTube
And I had to keep digging for quite a while to find an actual story, and the best I could find in English was a piece about a presentation by someone proposing this at like a birdwatching festival in Spain https://deltabirdingfestival.com/en/activity/the-owl-tile-teula-mussolera-a-conservation-and-cooperation-project/
The “Owl Tile” (teula mussolera): A Conservation and Cooperation Project

Jaume Ramot is an environmental activist and conservationist who, 35 years ago, co-founded the Grup de Natura Sterna (Sterna Nature Group) with his colleagues. He is currently the president of the…

Delta Birding Festival
Which at least got me a Spanish term for the thing - 'tuela mussolera' I could use to search for the *real* thing - yes it exists https://www.youtube.com/watch?v=GIfN_fyz54M
Teula mussolera

YouTube

This is super interesting!

I found this post in Catalan from this naturalist group that will send you a tile if you email them. They'll also explain how to install it and track its usage.

https://www.gno.cat/teula-mussolera-adopta-una-teula-niu

Teula Mussolera – Adopta una teula niu - Grup de Naturalistes d'Osona

Des del GNO – ICHN fa més de 30 anys que treballem en l’estudi i la conservació dels rapinyaires nocturns

Grup de Naturalistes d'Osona