martin vs western fence lizard

martin

noun
  • Any of various passerine birds of the family Hirundinidae, which also includes swallows, that catch insects whilst flying. 

  • A perforated stone-faced runner for grinding. 

western fence lizard

noun
  • Sceloporus occidentalis, a North American lizard. 

How often have the words martin and western fence lizard occurred in a corpus of books? (source: Google Ngram Viewer )