jackdaw vs sea crow

jackdaw

noun

  • A Daurian jackdaw, a closely related Asian bird (Coloeus dauuricus). 

  • A European bird (Coloeus monedula) of the crow family, often nesting in church towers and ruins. 

sea crow

noun

  • The Western jackdaw. 

  • The chough. 

  • The skua. 

  • The cormorant. 

  • The razorbill. 

  • The blackheaded pewit, and other gulls. 

  • The coot. 

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