Plural of buteo; multiple hawks or buzzards of the genus Buteo.
From 'buteo' plus the English plural '-s' (even though it's originally a Latin genus name, English pluralizes it with '-s' rather than the Latin '-ones').
Scientific names make English pluralization decisions practical: we could say 'buteones' (Latin) but we say 'buteos' instead. Over time, Latin scientific terms get anglicized into regular English plurals.
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