▁have ▁nas al ▁pass ages ▁that ▁attach ▁to ▁the ▁upper ▁bill ▁called ▁nar ic orn s . ▁Although ▁the ▁nost r ils ▁on ▁the ▁al bat ross ▁are ▁on ▁the ▁sides ▁of ▁the ▁bill , ▁unlike ▁other ▁t uben osed ▁se ab ird s . ▁The ▁b ills ▁of ▁Pro cell ari iformes ▁are ▁also ▁unique ▁in ▁that ▁they ▁are ▁split ▁into ▁between ▁seven ▁and ▁nine ▁horn y ▁pl ates . ▁They ▁produce ▁a ▁st om ach ▁oil ▁made ▁up ▁of ▁w ax ▁est ers ▁and ▁trig ly cer ides ▁that ▁is ▁stored ▁in ▁the ▁pro vent ric ulus . ▁This ▁is ▁used ▁against ▁pred ators ▁as ▁well ▁as ▁an ▁energy ▁rich ▁food ▁source ▁for ▁ch icks ▁and ▁for ▁the ▁adult s ▁during ▁their ▁long ▁fl ights . ▁Finally , ▁they ▁have ▁a ▁salt ▁g land ▁that ▁is ▁situated ▁above ▁the ▁nas al ▁passage ▁and ▁helps ▁des al inate ▁their ▁bodies , ▁due ▁to ▁the ▁high ▁amount ▁of ▁ocean ▁water ▁that ▁they ▁im bib e . ▁It ▁ex cre tes ▁a ▁high ▁sal ine ▁solution ▁from ▁their ▁nose . ▁ ▁The ▁Sal vin ' s ▁al bat ross , ▁white - c apped ▁al bat ross , ▁sh y ▁al bat ross ▁and ▁Ch ath am ▁al bat ross ▁were ▁all ▁considered ▁the ▁same ▁species ▁until ▁a ▁ 1 9 9 8 ▁article ▁by ▁Robert son ▁and ▁N unn . ▁Other ▁exper ts ▁followed ▁suit , ▁with ▁Bird Life ▁International ▁in ▁ 2 0 0 0 , ▁Bro oke ▁in ▁ 2 0