[beardyw]

I think the presence of predators would be important. We get Sparrow Hawks and the birds like good cover to avoid a surprise attack.

We get hawk shaped marks on the windows where the small birds fly towards them and do a quick turn which the hawk can't do.

[interstice]

I noticed the final concept doesnt have much (if any) visual cover - which I imagine plays a large part for a prey animal looking for a safe place.