Referencias

Referencias

 

König, et.al. Owls of the World. A&C Black Publishers, 2009.

Taylor, Lain. Barn Owls: Predator-Prey Relationships and Conservation. Cambridge University Press, 2004.

Scholz, Floyd. Owls. Stackpole Books, 2001.

Berger, Cynthia. Owls. Stackpole Books, 2005.

World of animals. Book of predators. Imagine publishing, 2014. Pp. 160-163.

Animals, a visual encyclopedia. Smithsonian. 2012. Pp. 122, 123.

Uhlenbroek, Charlotte. Vida animal. Pearson Alhambra, 2009. Pp. 96, 97, 230.

http://www.arkive.org

http://animals.sandiegozoo.org/animals/owl

http://wdfw.wa.gov/living/owls.html

http://animaldiversity.org/site/accounts/information/Strix_nebulosa.html