Birds would add great to the overall athmosphere!
We have cattle and horses which is great.
But I would imagine, that some lonely birds of prey or some flock of Birds would do an amazing job to enrich the allready living world of WOFF!
I can´t remeber if this feature has ever been in an sim. Wasn´t it in FSX?

Outgunned, outnumbered though never outclassed!