iNaturalist

iNaturalist is a social network for naturalists! Record your observations of plants and animals, share them with friends and researchers, and learn about the natural world.

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%... )

Owls Near Me

And I made this silly game. Name the beast, where you get a picture and try to guess (or know) the scientific name. https://name-the-beast.skabb.com
Name the Beast!

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.