We saved her, but … what is it?

Bigger than a sparrow, smaller than a baby pigeon, relatively jumpy, with a long beak and yellow on the inferior side of it. It was in the middle of a street from a neighborhood with a lot of green spaces, it couldn’t fly. I took it, of course, but we don’t have any knowledge about birds so we don’t know what is it. Is it a baby or an adult? What is he eating? For now I gave him some seeds and water and I am going outside for flies! We keep you posted.

Update: It’s probably a field fare.