Male, species confirmed by shape of aedeagus, as seen in second pic. M. scudderi would have diverging tips, where M. coreyi overlap and look more like a ring. Also saw a female "M. scudderi"-type, which was likely this species.

Rescued this Redhead today. It had a fishhook in its bill / face, and the fishing line it was attached to was frozen into the ice and the bird was trapped. Captured the bird, broke the fishing line, and then, with a friend, cut the fishhook in half and removed it from the duck's bill / face. It seemed vigorous and healthy. When we released it, it flew away strong and fast. Good deed done.