JAN EDWARDS: Another conundrum

I an really enjoying these animal rescue conundrums from Jan Edwards, and am going to have to put my thinking cap on to think of a snappy title for them. In the meantime here is the latest one. Jan Writes:

"This baby bird came in this evening having been found in the loft of a lady with bird-phobia. It is a fledgling, and is not very well, having been without food since this morning, handled by the man-of-the-house, and rattled about in a big box for a hour while they brought it to me.
It is mostly brown with a white wing bar. It is very small. Does anyone know what it is?"