horned owl vs long-eared owl

horned owl

noun
  • An owl of the genus Bubo native to the Americas, among the largest types of owl, having two horn-like tufts of feathers on its head. 

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 horned owl and long-eared owl occurred in a corpus of books? (source: Google Ngram Viewer )