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 bird flies at you and hits you it typically means they were unable to see you. It is also possible that they were protecting their young or they have some sort of illness.
You better get a net.
It means that was a tough and lucky bird. Other than that it means nothing whatsoever.
A bird flies because of a variety of specialized adaptations. THAT IS WHY A BIRD FLIES!
well it flies an hour long... did you mean how far?
It means that the bird hit your window so hard that it died.
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.
A humming Bird
Bird
Mariah Carey sings "She Flies Like a Bird"
quetzal means bird and coatl serpent, that is serpent that flies or plumed serpent