Sure thing, honey. The preposition in this sentence is "away." It shows the relationship between the bird and the window. Now go fly away and use that preposition in your own sassy sentences!
If you are looking not to harm the birds, you can get netting
that will protect the item you are covering the bird. You can also
find the species of the bird and find the type of items that they
will give away.
There are safe bird and animal repellents on the market that you
can buy. Try visiting www.birdbgone.com or www.bird-x.com for
suggestions.