@kolombiken personally I have none locally, these were from a recent trip to Yorkshire. As far as I know, Tree Sparrows have either a black or brown beak. (Unlike house sparrows who's beak colour can change with the seasons). It's not something I have thought about until you raised the question. But looking through other images of Tree sparrows,most are very dark.
@JimsPhotos@ohai.social Interesting! Tree sparrows around where I live have a beak that’s more on the gray side. But this looks black to me.
And now I need to photograph one around here so I can do a proper comparison.
@JimsPhotos@ohai.social blorb of summer.