▁formerly ▁used ▁for ▁the ▁hen ▁har rier ▁before ▁Mont agu ' s ▁was ▁identified ▁as ▁a ▁different ▁species . ▁ ▁Ident ification ▁ ▁Pl um age ▁Sex ual ▁dim orphism ▁is ▁particularly ▁apparent ▁in ▁the ▁pl um age ▁of ▁this ▁species . ▁Ad ult ▁males ▁are ▁character ized ▁by ▁their ▁overall ▁pale ▁grey ▁pl um age ▁contrast ing ▁with ▁black ▁wing ti ps . ▁Comp ared ▁with ▁other ▁har riers ▁this ▁species ▁has ▁characteristic ▁black ▁bands ▁along ▁the ▁second aries , ▁both ▁above ▁and ▁below ▁the ▁wing ▁and ▁rust y ▁stre aks ▁on ▁bel ly ▁and ▁fl anks . ▁Ad ult ▁females ▁have ▁a ▁broad ly ▁similar ▁pl um age ▁to ▁that ▁of ▁p all id ▁and ▁hen ▁har riers . ▁The ▁under parts ▁are ▁mostly ▁pale ▁yellow - b rown , ▁the ▁bel ly ▁with ▁longitud inal ▁stri pes ▁and ▁the ▁wing ▁cover ts ▁sp otted . ▁The ▁upper ▁parts ▁are ▁uniform ▁dark ▁brown ▁except ▁for ▁the ▁white ▁upper ▁tail ▁cover ts ▁(" r ump "), ▁and ▁the ▁sight ly ▁pal er ▁central ▁wing ▁cover ts . ▁ ▁The ▁ju ven ile ▁pl um age ▁res emb les ▁that ▁of ▁the ▁female , ▁but ▁diff ers ▁by ▁the ▁bel ly ▁and ▁under ▁wing ▁cover ts ▁which ▁are ▁not ▁sp otted , ▁but ▁uniformly ▁red ▁brown ▁in ▁colour . ▁ ▁A ▁mel an istic ▁form ▁occurs ▁regularly ▁in ▁this ▁species . ▁In ▁this ▁form ▁the ▁male ▁is ▁much ▁dark er ▁than ▁usual , ▁with ▁a ▁black ▁head , ▁brown ish ▁black ▁above ▁and