Steller sea lion vs sea lion

Steller sea lion

noun
  • A species of sea lion, Eumetopias jubatus, the largest of the eared seals. 

sea lion

noun
  • A steamer transporting cattle from the ports of Texas. 

  • A monster consisting of the upper part of a lion combined with the tail of a fish. 

  • A cow or bull transported by steamer from the ports of Texas. 

  • A marine mammal of any of several genera in the family Otariidae (the eared seals). 

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