: This is likely a short form for "aviculture" or simply an abbreviation for "birds" or "avifauna," but in the context of file naming or tags, it might simply denote the subject as related to birds or aviation (though the former seems more likely here).
"Paradisebirds Anna Nelly" refers to a controversial and defunct artistic project known for its high-quality photography and videography of children, which often appears in search results alongside file names like "avi.41". paradisebirds anna nelly avi.41