What is a noted morphological difference for the Florida Keys subspecies, Vireo griseus maynardi?

Answer

It is often noted for having slightly duller coloration compared to its mainland cousins

Geographic variation leads to distinct morphological traits among subspecies, illustrating microevolutionary events driven by local selection pressures. The Florida Keys subspecies, identified as *Vireo griseus maynardi*, exhibits a subtle but consistent difference when compared directly against the mainland populations, such as the nominate *griseus*. Specifically, this southern, insular population tends to display a slightly duller coloration in its plumage overall. Such differences in saturation might be traced back to local adaptations in camouflage, where a less vibrant hue provides superior crypsis against the specific visual landscape, such as darker leaf litter or unique shading patterns present in the subtropical island environment.

What is a noted morphological difference for the Florida Keys subspecies, Vireo griseus maynardi?
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