and then they flatter in panic. such situations are typical; often it comes to heavy injuries. even though a bird might be used to glass doors or windows, something can cause a panic reaction and then the flight instinct is stronger than anything else. without remembering what they usually know about their surrounding birds crash into walls, windows or similar obstacle. in many cases the after-effect of such a violent collision is a head injury or a concussion. some birds even break their necks and die immediately.
if a bird is unconscious after a collision or is in sorry state (unable to move), it's most likely that the animal is heavily 