Usage History of 'passerines'

The following chart shows how frequently 'passerines' appeared in printed materials over time. For example, the word 'passerines' occurred 2 times in books in 1826 and 3,620 times in 2008. From 1826 to 2008, the word 'passerines' was used a total of 79,847 times in books scanned by Google. See Reference: Google Ngram project.

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