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The winter social systems of Wood Thrushes may be similar to the model of Ovenbirds (Seiurus aurocapilla), as they are also sexually monomorphic ground-foragers.
Abstract: Seventy-five percent of psittacine species, including the blue-fronted Amazon parrot (Amazona aestiva), are classified as sexually monomorphic.
Many parrot species are sexually monomorphic, but when gender differences can be seen in the field they are mentioned and illustrated.
In contrast, no sex ratio bias was found in the sexually monomorphic Yellow-naped Amazon (Amazona auropalliata) (South and Wright 2002).

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