There's a nest box in Hellgate, MT
https://www.facebook.com/Montana-Osprey-Cams-165072613556909 with a similar
story, two females, two nests, one male.
Iris, one of the females is an eldery mom but has raised many healthy
babies over the years. Her mate Louis is also mated to Star at another nest
Orpheus is a serial polygamist—who knew Ospreys could have such a colorful
sex life? This is the third year the Ospreys at Salt Point, Lansing, have
been involved in a polygamous relationship. Read about it at:
*https://www.lansingrec.com/images/Blog__387_One_bird_too_many.pdf