A large concentration of Masked Ducks (Nomonyx dominicus) in Puerto Rico
The little-studied Masked Duck (Nomonyx dominicus) inhabits ponds and small lakes covered with emergent or floating vegetation from southern Texas south through Central and South America (east of the Andes) to northern Argentina. We document a large flock of > 140 individuals at Laguna Cartagena National Wildlife Refuge, Lajas, Puerto Rico, on 5 February 2012.
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