The birds of a region, habitat, or geological period considered as a group.
From Latin 'avis' (bird) + 'fauna' (animals of a region), a scientific term created in the 19th century following the model of 'flora' (plants) and 'fauna' (animals).
Ornithologists use 'avifauna' to talk about all the birds living in a place, kind of like how 'avifauna' of the Amazon is completely different from the avifauna of the Arctic—it's like having a species passport for birds.
Complete word intelligence in one call. Free tier — 50 lookups/day.