https://www.pbase.com/nicolebouglouan/hawk_owl&view=slideshow
NORTHERN HAWK OWL - SURNIA ULULA - CHOUETTE EPERVIERE Photo Gallery by nicolebouglouan at pbase.com
northern hawk owl
https://www.nps.gov/articles/northern-hawk-owl.htm
Northern Hawk Owl (U.S. National Park Service)
northern hawk owlu snational parkservice
https://fieldguide.mt.gov/speciesDetail.aspx?elcode=ABNSB07010
Northern Hawk Owl - Montana Field Guide
Montana Field Guide contains a wealth of information about Montana's diverse species.
northern hawk owlmontanafieldguide
https://ecobirder.blogspot.com/2012/11/northern-hawk-owl.html?showComment=1352923699101
Ecobirder: Northern Hawk Owl
ecobirdernorthernhawkowl