iNaturalist
iNaturalist
The iNaturalist API is an absolute gem. It doesn't require authentication for read-only operations and it has open CORS headers which means it's amazing for demos and tutorials.
My partner and I built this website with it a few years ago: https://www.owlsnearme.com/
(I realize this is a bit on-brand for me but I also use it to track pelicans https://tools.simonwillison.net/species-observation-map#%7B%... )
OK I absolutely love that!
I got 0/4 though on the easiest difficulty level. Feature request: a version where you have to guess the common name instead, I think that would still be fun.