From explorer.org

Magpie looking to snack on what mamma is protecting. Keep your guard up, momma!

    • anon6789OP
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      fedilink
      69 days ago

      I tried to extract a frame but the resolution isn’t great. You can kinda see the obstruction of the pupil better than the actual membrane, but it’s taking advantage of its “eye armor” known as the nictitating membrane. You may have seen it on cats before, but they have a third semi-transparent eyelid that can keep their eyes safer in a scuffle. Momma doesn’t want to lose her visual on her intruder, but she also doesn’t want to catch a beak to the face.

      Here’s a clearer image of the membrane on this Great Horned.