Relating to or characteristic of the birds of a particular region or time period.
From 'avifauna' (noun) + adjective suffix '-al,' following the pattern of turning scientific nouns into adjectives (like 'faunal' from 'fauna').
When paleontologists dig up fossils, they compare the 'avifaunal assemblages' from different time periods to understand how birds evolved and migrated—it's detective work using bird fossils as clues.
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