With SoZ we have ravens and some exotic birds as effects to place on the rooftops. However why not go further with the idea of ambient animals?
More birds like seagulls, small common birds, hawks and chicken/rooster would work well as ambient birds too. You probably already have the models and animation needed in NWN2 (from exiting bird FX), you just need to reskin the birds.
Secondly, you could extend this to some common animals like cows, horses and other animals that you might use as background that players should never reach, or have areas that have no walkmesh.
As a final note, these could be either FX or placeable. Placeables do dye and scale, which could be useful...
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