I just hung a sheer curtain

[hunter]

6. I hung ordinary window screen loosely a few inches in front of the glass.

It's held by a rod at the top, and a rod at the bottom that acts as a counterweight. The bottom rod is very loosely tied to the house to keep the screen from flapping about on windy days.

A also painted the screen white with spray paint. From the outside it looks more like a wall, and less as open space, as reflected in the glass.

The birds still hit the screen sometimes, but it acts like a blanket.

For a long time I had trouble with a hawk who would swoop in on birds enjoying our kitchen garden, scattering them wildly. Inevitably one or two terrified birds would stun themselves hitting the glass, and end up as lunch for the hawk. I began to think the hawk was doing it on purpose.