Compare Aromanian bardzu ‘white’; possibly from Albanian bardhë ‘white’. Alternatively it may be a pre-Roman substratum word. Possibly via Dacian from Proto-Indo-European *bhereg-, "white". The Romanian word is akin to Albanian bardhë, and possibly derived/borrowed from it. This bird is called "white" also in the Slavic languages: compare Croatian labud. Another theory, though somewhat unlikely, suggests its origin in a Latin root *gardea, from ardea. (compare Spanish garza, Portuguese garça, also French barge). The confusion of g and b is somewhat unusual, but may be explained as a Balkan influence. Other cases in Romanian include limbă, rug, negură, întreba (compare also Sardinian bula, from Latin gula) .