for a time thought to be not closely related to toucans and woodpeckers, but instead to the order Coraciiformes. However, analysis of nuclear DNA confirmed that Galbuli and Pici are sister groups, and thus their similarities such as zygodactyl feet were inherited from their common ancestor. Some classifications continue to treat Galbuli as a separate order (Galbuliformes), in which case Piciformes becomes equivalent in scope to Pici.

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