budgerigar vs lovebird

budgerigar

noun
  • A species of small green parrot, Melopsittacus undulatus, native to inland Australia; a common cagebird throughout the world and bred in many colour varieties. 

lovebird

noun
  • Any small parrot from one of the nine species within the genus Agapornis. Sometimes they are kept as cage birds and are noted for their affection towards each other. 

  • One of the members of an openly affectionate couple. 

verb
  • To express romantic affection openly. 

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