mammal vs wildling

mammal

noun
  • An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young. 

  • A vertebrate with three bones in the inner ear and one in the jaw. 

wildling

noun
  • A wild animal 

  • A wild, i.e. not cultivated, plant 

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