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On 9 February 2022 at the Billy Frank Jr National Wildlife Refuge, Erika and I watched a preening Red-breasted Merganser. For once the merganser’s serrated bill edges are visible in these photos, especially if you enlarge the images. These serrations make mergansers among the most specialized ducks. Red-breasted Mergansers are most closely related to Common or Chinese mergansers, and all are probably descended from smaller mergansers in South America (Craik et al. 2020).
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