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Ridgway, 1886: NOTE(AS: Mexican Duck Anas diazi is related to Black and Mottled Ducks and should be recognized (McCracken et al. 2001); lump by AOU cites only Hubbard (1977). Split accepted by Chesser et al. (2020), NACC 2020-A-08.)
Canard du Mexique
Bird Data App text
Like the [Mottled Duck], a race of the [Mallard] where the male looks like the female.