Single Female of Northern Pintail Drinks River Water

This spinster female of Northern Pintail (Anas acuta, family Anatidae) wasn't courted by bachelor males somehow. I wonder if she had not sexually matured yet. She drank water from a winter river before and after preening herself. Captured in the cloudy midafternoon of early-January 2020 in Japan. For a full story (text in Japanese); https://sigma-nature-vlog.blogspot.com/2020/06/blog-post_50.html

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