bottle-nosed dolphin vs bottlenose dolphin

bottle-nosed dolphin

bottlenose dolphin

noun
  • One of the species of gray dolphin in the genus Tursiops, between 2 and 4 meters in length inhabiting warm and temperate seas worldwide. 

  • Tursiops truncatus, the common bottlenose dolphin, famous for its presence in aquarium shows. 

How often have the words bottle-nosed dolphin and bottlenose dolphin occurred in a corpus of books? (source: Google Ngram Viewer )