It could mean that the bird sees its reflection in the window and thinks that it is seeing another bird, or it could mean that, at some time, someone put out bird seed onto your window sill.
Is it bad luck for a bird to fly into a window and die
It might have just been a stupid bird or it might have short sight or it might have seen its reflection and thought it was another bird it all depends on what type of bird it was.
it is seeing itself and thinks it is another bird it poops allover your car while it is doing this.
it means that a small yellow bird is on your window screen
A bird will fly outdoors or indoors, birds just fly.
This means that there is a bird there or that there is a bird close making the shadow.
When a blue jay hits a window but survives, it may be disoriented or stunned. It is recommended to give the bird some time to recover before it flies away. To prevent further collisions, consider placing decals or stickers on the window to make it more visible to birds.
dead
Nothing of any significance.
A black bird symbolizes death.
A bird in the house is a sign of a death. If a robin flies into a room through a window, death will shortly follow.