eagle owl vs long-eared owl

eagle owl

noun
  • Any of various Old World large owls of the genus Bubo, especially the Eurasian eagle owl, Bubo bubo, that have prominent ear tufts. 

long-eared owl

noun
  • Asio otus, a species of owl which breeds in Europe, Asia, and North America. Long eared owls are partially migratory, moving south in winter from the northern parts of their range. 

How often have the words eagle owl and long-eared owl occurred in a corpus of books? (source: Google Ngram Viewer )