Greetings. I think this is a juvenile, though it might be a mature female. I think, though, that because of the ill-defined darker brown on the bird's head, it is a juvenile.Want to help with that?

I was taking instruction at the Bosque del Apache during the Festival of the Cranes. The best of all possible worlds. Just inside the beginning of the tour loop is a small pond that was dominated by Northern pintails, which were flying in from a larger pond across a road.

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Canon 5D IV, 600mm f/4 II
1/2000, f/4, ISO 125

Basic modifications in LR. Unsharp mask subject; NR in Nik dFine in PS.