As the climate warms, eastern screech-owls might be expected to extend their range northward (as is currently happening in Maine) and uphill, unless limited by Barred Owl predation.

The land area where the barred owls need to be controlled is just too vast, he said. And barred owls from elsewhere, he said, will simply fly in and replace those that are felled. As few as 3,000 ...

The survival of spotted owls meant a lot to me as a young environmental activist. In 1985, I spent days living on a plywood platform perched high in the canopy of an Oregon Douglas fir.

This combination of a northern spotted owl, left, in the Deschutes National Forest near Camp Sherman, Ore., and a barred owl in East Burke, Vt. Barred owls are native to eastern North America but ...

This combination of 2003 and 2006 photos shows a northern spotted owl, left, in the Deschutes National Forest near Camp Sherman, Ore., and a barred owl in East Burke, Vt. Barred owls are native to ...