Could it be you are selecting birds that are not actually in Europe, let alone native, yet are still listed for some reason, e.g., the wild turkey and california quail?

It makes me question the accuracy of the data if anything, especially since the Black Grouse also exists in places that are not mapped and I don’t see anything that could explain omissions, e.g., what the data is based on and how it is collected. My guess based on inexplicable data points for wild turkeys and california quail is that it’s somehow human logged sightings that are accidentally or either impressively logged.

Indeed! I wasn't even able to change the bird easily. I like the initiative, though. I remember the whole bird migration from Africa to Europe and how it shapes the skies in autumn and spring.