Defending the cave nest. The Great-horned Owl, male, was guarding the entrance to the cave nest. Immediately behind him are the female and eggs. Crows and/or ravens were mobbing the nest early this morning. Canon 5Dmk3, Canon EF400mm f/5.6L USM, f/5.6, 1/200s, ISO 400, lens focal length 400mm. 03/31/15 8:01AM MDT. Larimer County, Colorado.
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