The phylogenetic and taxonomic status of galliform birds is difficult to ascertain. This study reviews previous research
on molecular techniques and morphological characteristics (e.g., plumage color) of Tragopan, Ithaginis,
and Perdix to elucidate the polymorphism and taxonomic criteria of some galliform genera. Taxonomic criteria
include genetic and morphologic characteristics (e.g., body color). Plumage color is associated with sexual selection
and environmental factors and, therefore, is an important criterion in bird taxonomy. The results of this study
reveal the polymorphism of some galliform birds and the difficulty in ascertaining the taxonomic status of these
birds.
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