Usage History of 'duckbills'

The following chart shows how frequently 'duckbills' appeared in printed materials over time. For example, the word 'duckbills' occurred 8 times in books in 1834 and 258 times in 2008. From 1834 to 2008, the word 'duckbills' was used a total of 9,164 times in books scanned by Google. See Reference: Google Ngram project.

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