Requiring an internet connection for a nature app is absurd. As annoying as it is I get why a big tech company like Google fails at this sort of thing, many of their employees probably never leave a city and so the products always work well for them. But a nature app has no excuse, normal usage will get blocked by that all the time.

That's what Merlin is for but it's a ~450mb install. BirdNet is only a ~30MB install and birds are everywhere, so what's wrong with having an online option for most people who spend most of their time within range of a cel tower?