bushchat vs rufous-tailed scrub robin

bushchat

noun
  • Any of several African birds in the genus Cercotrichas. 

  • Any of a number of small insect-eating birds in the muscicapid genus Saxicola. 

rufous-tailed scrub robin

noun
  • Cercotrichas galactotes, a species of bird. Also called rufous scrub robin, rufous bush robin, rufous warbler, rufous bush chat 

How often have the words bushchat and rufous-tailed scrub robin occurred in a corpus of books? (source: Google Ngram Viewer )