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A 2015 study found that people posting duck face pictures are more likely to be associated with neuroticism.[2][3]
In an animal communication studies of capuchin monkeys, the “duck face” term has been used synonymously with “protruded lip face”, which females exhibit in the proceptive phase before mating.[4][5]
OxfordDictionaries.com added “duck face” as a new word in 2014 to their list of current and modern words, but it has not been added to the Oxford English Dictionary.[6][7]
In the 1994 film Four weddings and a funeral, one of the lead charterers, Henrietta, played by Anna Chancellor, is called Duckface throughout the film.