Help a bird
If you find a bird stunned by a window collision:
Often when a bird collides with a window, it is just stunned and will be flying again within an hour, after regaining its senses.
Carefully pick up the bird and place it in a well-ventilated box on something soft, like an old towel, and put the box in a warm and quiet area to recover. Avoid over handling the bird and the box.
If the bird has made no signs of recovering contact a rescue centre or 'bird friendly' vet clinic for further advice.