eared seal vs fur seal

eared seal

noun
  • A seal belonging in the Otariidae family; a fur seal or a sea lion, differing from the true seals in having small, visible ears and the ability to walk on land. 

fur seal

noun
  • A marine mammal of either of the genera Arctocephalus or Callorhinus of the eared seal family Otariidae, differing from the sea lions in having dense underfur. 

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