Feds plan to kill half a million barred owls in West Coast states over the next three decades (Oregonian, 3/28/2024)
Effects of experimental removal of barred owls on population demography of northern spotted owls in Washington and Oregon: 2016 progress report (2017) United States Geological Survey
Effects of Barred Owl (Strix varia) removal on population demography of Northern Spotted Owls (Strix occidentalis caurina) in Washington and Oregon, 2015-18 (2019) United States Geological Survey