▁black ▁to ▁dark ▁gray / b rown , ▁with ▁a ▁thick ▁tail ▁stock , ▁flu ke ▁with ▁sharp ly ▁pointed ▁tips , ▁bul b ous ▁head , ▁and ▁a ▁broad , ▁sick le - sh aped ▁d ors al ▁fin . ▁Color ation ▁typically ▁includes ▁light ▁grey ▁to ▁white ▁areas ▁such ▁as ▁a ▁s addle ▁patch ▁behind ▁the ▁d ors al ▁fin , ▁a ▁light ▁grey ▁or ▁white ▁anchor - sh aped ▁patch ▁under ▁the ▁ch in ▁and ▁bel ly , ▁and ▁a ▁bla ze ▁mark ing ▁behind ▁the ▁eye . ▁These ▁tra its , ▁however , ▁can ▁vary ▁between ▁populations . ▁For ▁example , ▁two ▁distinct ▁forms ▁are ▁described ▁from ▁on ▁the ▁Pacific ▁coast ▁of ▁central ▁Japan : ▁the ▁Sh i ho ▁morph ot ype ▁is ▁the ▁larger ▁of ▁the ▁two – f em ales ▁, ▁males ▁– and ▁has ▁a ▁white ▁d ors al ▁patch ▁and ▁round ▁mel on , ▁while ▁the ▁N ais a ▁type ▁is ▁smaller – f em ales ▁, ▁males ▁– with ▁a ▁characteristic ▁fl atten ed ▁or ▁squ ar ish ▁mel on ▁and ▁a ▁dark er , ▁ind ist inct ▁s addle ▁patch . ▁When ▁they ▁are ▁born , ▁short - f inned ▁pilot ▁wh ales ▁we igh ▁about ▁ ▁at ▁a ▁length ▁of ▁. ▁ ▁Long - f inned ▁and ▁short - f inned ▁pilot ▁wh ales ▁are ▁often ▁hard ▁to ▁tell ▁apart . ▁However , ▁as ▁their ▁names ▁indicate , ▁short - f inned ▁pilot ▁wh ale ▁f li ppers ▁are ▁shorter ▁than ▁those