Cygnus falconeri is an extinct, very large swan known from Middle Pleistocene-aged deposits from Malta and Sicily. Its dimensions are described as exceeding those of the living mute swan by one-third,[2] which would give a bill-to-tail length of about 190–210 cm (75–83 in) (based on 145–160 cm for C. olor[3]). By comparison to the bones of living swans, it can be estimated that it weighed around 16 kg (35 lb) and had a wingspan of about 3 m (9.8 ft).[4][5][6] Due to its size, it may have been flightless.[7] The remains of the species are associated with the Elephas mnaidriensis faunal complex, and became extinct long before the arrival of people to Sicily and Malta.[8] Its bones are exhibited at Għar Dalam museum in Birżebbuġa, Malta.
^Watanabe, J., & Matsuoka, H. (2015). Flightless diving duck (Aves, Anatidae) from the Pleistocene of Shiriya, northeast Japan. Journal of Vertebrate Paleontology, 35(6), e994745. https://doi.org/10.1080/02724634.2014.994745
^Watanabe, J. (2017). Quantitative discrimination of flightlessness in fossil Anatidae from skeletal proportions. The Auk, 134(3), 672–695. https://doi.org/10.1642/auk-17-23.1