If what Mme Owl brought in was actually a white-winged dove, and the wing-edge markings appear consistent with that possibility, that would make this the largest prey item I’ve ever seen any of my owls deliver to the nest in 13 years of observation.
13 years? Not quite on the edge of 17.
Just like the white winged dove
Sings a song, sounds like she's singing
Whoo, whoo, whoo.

Sing it Shaky!
