These water kingfishers are descended from a common ancestor which seems to have been closely related to a progenitor of the Pied Kingfisher (which at that stage had not yet lost the metallic plumage tone), and are similar in plumage and habits (Moyle, 2006).
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The Ringed Kingfisher, Megaceryle torquata, a more distant relative, also occurs on the same rivers, but is twice as heavy as the Amazon Kingfisher.
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The Megaceryle kingfishers were formerly placed in the genus Ceryle with the Pied Kingfisher, but the latter is genetically closer to the American green kingfishers.