fritillary vs hazel grouse

fritillary

noun
  • Any of several butterflies, of the family Nymphalidae, having wings with black or silvery spots. 

  • Any of several bulbous perennial plants, of the genus Fritillaria, having flowers with a spotted or chequered pattern. 

hazel grouse

noun
  • A bird in the grouse family, Tetrastes bonasia, native to most of temperate-cool Eurasia. 

How often have the words fritillary and hazel grouse occurred in a corpus of books? (source: Google Ngram Viewer )