endangered vs protected

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) 

protected

adj
  • Having the protected access modifier, indicating that a program element is accessible to subclasses but not to the program in general. 

  • defended 

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