For decades, barred owls from Eastern states have been invading the breeding territory of the northern spotted owl in California, Oregon and Washington. (discovermagazine.com)
They measured levels of the stress hormone corticosterone in fecal samples collected from 16 pairs of spotted owls nesting on the Yakama Indian Reservation in Washington, and from about 150 other owls scattered across the Pacific Northwest. (sciencemag.org)
While two of the three 4FRI prescriptions for Mexican Spotted Owl Protected Activity Centers (MSO PAC) would result in negligible changes in basal area, one would allow for basal area reductions greater than 30 % [19]. (journals.plos.org)