Tag Archives: Bald Eagles

Eagle Eyes!

January 6, 2025: DNF's nictitating eyelid. This translucent third eyelid sweeps in from the side to moisten and protect her eye without obscuring her vision. More on eagle eyes here: https://www.raptorresource.org/2025/01/10/eagle-eyes-2/

Has anyone ever called you eagle-eyed? Relative to humans, bald eagles have larger, sharper eyes that see further, collect more details, and produce stereoscopic vision to greatly improve depth perception. A bald eagle’s visual acuity begins with its eye size and shape. Mr. North’s somewhat tubular eyes occupy over 50% of the volume of his skull, as compared with less than 5% in us spherically-eyed human types.  He can voluntarily adjust the curvature of his large cornea and lens (we’re

November 25, 2024: If anyone needs me, I’ll be over here with my sticks!

November 24, 2024: DNF dresses Mr. North in her favorite stick! More seriously, the two brought in an incredible 32 sticks into the nest between sunrise on Friday morning and sunset on Friday night, along with a whole bouquet of cornhusk roses, stalks, and grass!

If anyone needs me, I’ll be over here with my sticks! I miss a few days of nestorations and it looks like the Decorah North and Fort St. Vrain Bald Eagles have redone the place! The eagles piled yet another layer of sticks on and are filling both nests with soft materials, including corn stalks, husks, and grass at the North Nest, and grass at Fort St. Vrain. I can’t pick a favorite video this time: we’ve got DNF in

Eagle Eyes!

Human Eye versus Eagle Eye

Has anyone ever called you eagle-eyed? Relative to humans, bald eagles have larger, sharper eyes that see further, collect more details, and produce stereoscopic vision to greatly improve depth perception. A bald eagle’s visual acuity begins with its eye size and shape. Dad’s somewhat tubular eyes occupy over 50% of the volume of his skull, as compared with less than 5% in us spherically-eyed human types.  He can voluntarily adjust the curvature of his large cornea and lens (we’re restricted