pilot whale
noun
                                
              
          
                                                      : either of two dark gray to black, medium-sized toothed whales (Globicephala melas and G. macrorhynchus) of temperate to tropical waters that have a large rounded forehead and short snout and typically feed on squid and small fish                                      
                
called also blackfish
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  Merriam-Webster unabridged




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