where you live and what previous data has been collected for your local species [BirdNET](https://play.google.com/store/apps/details?id=de.tu_chemnitz.mi.kahst.birdnet) - identify birds via birdsong. Says it covers North America and Europe. [iNaturalist](https://play.google.com/store/apps/details?id=org.inaturalist.android) - Identify both ... plants and animals by photo data. I think the biggest of this type of thing. [Seek](https://play.google.com/store/apps/details?id=org.inaturalist.seek) - simpler version of iNaturalist aimed at kids/families that has achievements [Flora Incognita](https://play.google.com/store/apps/details?id=com.floraincognita.app.floraincognita) - Identify