KB, Livezey (2010). „Killing barred owls to help spotted owls II: implications for many other range-expanding species”. Northwestern Naturalist. 91 (3): 251—270. JSTOR40983223. doi:10.1898/NWN09-38.1.
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KB, Livezey (2010). „Killing barred owls to help spotted owls II: implications for many other range-expanding species”. Northwestern Naturalist. 91 (3): 251—270. JSTOR40983223. doi:10.1898/NWN09-38.1.
Livezey KB, Elderkin MF, Cott PA, Hobbs J, Hudson JP (2008). „Barred owls eating worms and slugs: the advantage in not being picky eaters”. Northwestern Naturalist. 89 (3): 185—190. JSTOR30135134. doi:10.1898/NWN08-04.1.