Windows and glass
Windows, glass doors, greenhouses and even decorative mirrors can be lethal for birds
Many birds only see open sky reflected in the glass and don’t realise it is a flat surface
Often the first you know about this is the loud bang of the bird impact.
Larger birds can sometimes survive the impact, but most smaller birds die from their injuries or from shock. Do anything you can to limit bird strikes.
Rooms with windows facing each other are often more susceptible to bird strikes
Windows with net curtains or blinds are less likely to be struck
Decals of bird silhouettes are available to help birds to see the window surface
Ornamental mirrors are not recommended for outdoor use