> practices have been shown to have an impact on most woodpecker populations. In areas with fewer larger woodpeckers (due to loss of habitat), larger owls populations were impacted, followed by small mammals, birds, and insects using these same trees for various purposes.

This makes a very good point.  We happen to live beside an ancient wood which at our end is almost completely unmanaged.  We have a rich variety of birds, including woodpeckers, and we hear tawny owls almost every day/night.  Certainly plenty of insects, including hornets - rare in many places now - and small mammals including wood mice and voles.  Barn owls also take advantage of the feast on offer.
How it used to be!

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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