In a manner relating to or concerning the animals of a particular region or time period.
From 'faunal' (adjective) plus '-ly' adverbial suffix. This creates an adverb from a technical adjective. It's a specialized term used primarily in scientific writing.
This is the kind of word you mostly find in scientific papers rather than everyday conversation! Phrases like 'faunally diverse' or 'faunally similar' let scientists describe how ecosystems compare in terms of their animal composition with precision.
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