lemur vs orangutan

lemur

noun
  • Any strepsirrhine primate of the infraorder Lemuriformes, superfamily Lemuroidea, native only to Madagascar and some surrounding islands. 

  • Any of the genus Lemur, represented by the ring-tailed lemur (Lemur catta). 

orangutan

noun
  • Any of three species of arboreal anthropoid ape, characterised by their shaggy reddish-brown coat and long arms, which comprise the genus Pongo; Pongo pygmaeus of Borneo, Pongo abelii of Sumatra or Pongo tapanuliensis of South Tapanuli (in Sumatra). 

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