It probably failed to see the glass.
People have assigned meanings to the most mundane things. None of which have any scientific basis.
It this case it may have to be a particular type of bird, or time of day, or who saw it, or what the weather was like etc.
In other words it depends who you ask.
When a bird flies into a window and dies, it means that transparent windows are different from anything that was encountered by birds in the course of their evolutionary history, and as a result, they are not well prepared by their instincts or Biology in general, to deal with this particular hazard.
Some people see a bird flying into a closed window as an omen of death.
Not all naturally occurring phenomenon can or should be interpreted as a sign or omen.
At various times of the day, as the light outdoors reflects off of windows they take on the appearance of mirrors. A bird flying low might think it is seeing more garden or wooded area ahead, when it is in fact seeing the reflection of what is behind it.
Where I live we have at least one bird a day bump into a window. Most, but not all of them survive. For this reason we have placed decals on the window surface to try to cut down on the problem.
Not all naturally occurring phenomenon can or should be interpreted as a sign or omen.
At various times of the day, as the light outdoors reflects off of windows they take on the appearance of mirrors. A bird flying low might think it is seeing more garden or wooded area ahead, when it is in fact seeing the reflection of what is behind it.
Where I live we have at least one bird a day bump into a window. Most, but not all of them survive. For this reason we have placed decals on the window surface to try to cut down on the problem.
It means you have a dead hawk in your yard.
It means that the bird was confused and possibly sick.
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.
Is it bad luck for a bird to fly into a window and die
Uh.....NO?!? It just means that they are DEAD not you.
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.
It means that was a tough and lucky bird. Other than that it means nothing whatsoever.
There is a school of thought that says if a bird, any bird, flies into your window and dies there will be a death in the household. If there were any truth to this superstition the profusion of birds flying into skyscrapers would be quite frightening. The superstition started at a time when glass and by extension windows, were expensive and small. The likelihood of it happening was small and the correlation between the happening and a death more noticeable.
it means that a small yellow bird is on your window screen
it is seeing itself and thinks it is another bird it poops allover your car while it is doing this.
A bird will fly outdoors or indoors, birds just fly.
It is a bad omen
This means that there is a bird there or that there is a bird close making the shadow.
It's reached the end of its life.