The sparrow is a flighty bird

But sometimes I get lucky, and manage to get one in focus.
This one was inside the Africa Pavilion at the Metro Zoo, perched fairly high on the grating that I would assume was intended to keep the flying birds on one side or the other of itself.
And yes, I do agree with this guy on the feeder -- I need to clean that window.
So far as my limited identification skills will allow, these guys are all House Sparrows, and thus of modest interest to birders, but, hey -- challenging photographic subject!