endangered vs strange

endangered

adj
  • in danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct) 

strange

adj
  • Having the quantum mechanical property of strangeness. 

  • Outside of one's current relationship; unfamiliar. 

  • Not normal; odd, unusual, surprising, out of the ordinary. 

  • Not belonging to one. 

  • Unfamiliar, not yet part of one's experience. 

  • Of an attractor: having a fractal structure. 

noun
  • Sex outside of one's current relationship. 

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