Fowl is a word for birds in general but usually refers to birds belonging to one of two biological orders, namely the gamefowl or landfowl (Galliformes) and the waterfowl (Anseriformes). Studies of anatomical and molecular similarities suggest these two groups were close evolutionary relatives; together, they form the fowl clade which is scientifically known as Galloanserae. This clade is also supported by morphological and DNA sequence data as well as retrotransposon presence/absence data.

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