Management of endangered Spotted Owl populations brought the controversy to a head. Substantial tall shrub cover is a common characteristic of spotted owl habitat. The northern spotted owl is primarily nocturnal. The endangered northern spotted owl is seen occasionally. Declining northern spotted owl populations led to the plan's implementation. The two also befriend a spotted owl named Hortense. The northern spotted owl is intolerant of habitat disturbance. Alternative common names include spotted owl and brown owl. The threatened northern spotted owl also inhabit the mountain forests. Concern was expressed that barred owls may compromise spotted owl populations with novel parasites. The northern spotted owl ("Strix occidentalis caurina") is one of three spotted owl subspecies. Otulissa is a female spotted owl, "Strix occidentalis". Spotted owl pairs are monogamous and rarely renest after failed breeding attempts. Vancouver Island marmot, spotted owl, American white pelican, and badgers. The spotted owl has been hypothesized to be within a superspecies with the barred owl.