Birds flying into windows (1 Viewer)

Hey all one of my regular little buddies accidentally flew into my sliding glass door thankfully they had reduced their speed quite a bit before actually running into it and was able to fly away after the ordeal but I watched it happen as my blinds were completely open and I felt awful, is there anything I can put on my windows to help prevent this? Did it happen because my blinds were wide open? Are there any recommendations so this doesn't happen again? Thank you!

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I think problems can occur for a number of reasons but basically the bird doesn't realise the glass is there - windows on both sides of a building can be a problem as can dried grass displays. Putting decals or window stickers such as a bird of prey can help a lot where it happens frequently.