Bufflehead is an adaptation of their scientific name which means buffalo-head. In this photo, notice how the female has fluffed out the feathers on her neck, which gives the appearance of the head and neck being much larger than it actually is. While they are not in the family of stiff-tailed ducks like the ruddy duck, I suspect they do use their tails as an aid in diving. Here, the female has her tail in a position often seen in the ruddy duck.
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