I found a bird in our work canteen today. Managed to coax it outside onto a balcony but it's still out there. (it was hours ago). the balcony is narrow and enclosed on all four sides (quite a small space) with glass. I don't know whether the bird just hasn't worked out that it can fly out through the top but I don't know what to do - don't want it to be out there all night. What should I do? I'm really worried about it!