It sees its reflection, and may think it is seeing a rival of its own species. Same as when you put a mirror in a bird's cage.
No it doesnt.It is usually a warning.
I suppose you could interpret it that way, since a bird tapping on a window is an omen of death.
Birds are territorial, especially woodpeckers. The bird has accepted your home as his ... you could hang some CD's from strings to attempt scaring the bird away. Fake owls simply do not work at all.
The word 'tapping' is a special case. It in its various forms can be used as both a verb or onomatopoeia.If you were to say, "The bird was tapping at the window.", it would be categorized as a verb.On the other hand, if you were to say: "There, once again, appeared the bird at the window. Tap! Tap! Tap!, I heard on the glass."The 'tapping' would be onomatopoeia.
the tapping is called "MORSE CODE"
knocking
Maybe it wants to come into your house? Hungry? Water? Give it some food. Maybe a bit coocoo in the head????
The speaker suggests that the tapping sound might be caused by someone tapping on the window to try and scare them or get their attention.
The woodpecker
Tapping on a door or a window is called gcoinnkk
Woodpecker !
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.