How can you treat a bird which has hit a window?

This is an extract from notes prepared by the British Trust for Ornithology (BTO). The full note can re read by clicking on http://www.bto.org/gbw/science/windowstrikes.htm

Often birds will fly off - which is great. Sometimes they die instantly, probably from a broken neck. However, on many occasions birds seem to be just stunned. Put the bird in a dark cardboard box - without food or water - and leave it in warm (but not hot), quiet place for an hour or so. Take the box outside, open the box and, if you are lucky, the bird will fly off. If the bird does not seem to be recovering, you may wish to take it to your local vetinarian, who should be able to give it the appropriate treatment.