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avifaunal vs avifauna

avifauna vs avifaunal

avifaunal is not a noun while avifauna is a noun.

avifaunal is an adjective but avifauna is not an adjective.

avifaunal (noun) avifauna (noun)
the birds of a particular region or period
avifaunal (adjective) avifauna (adjective)
of or relating to birds of a particular region or period

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