0 4 , ▁AC AP ▁in ▁ 2 0 0 6 , ▁and ▁S AC C ▁in ▁ 2 0 0 8 . ▁Some , ▁however , ▁like ▁James ▁Clement s ▁( at ▁the ▁time ▁of ▁his ▁death ) ▁didn ' t ▁agree , ▁nor ▁has ▁Corn ell ▁University ▁since ▁( which ▁is ▁responsible ▁for ▁his ▁book ). ▁M ole cular ▁analysis ▁has ▁shown ▁that ▁it ▁and ▁the ▁closely ▁related ▁Ch ath am ▁al bat ross ▁( also ▁considered ▁to ▁be ▁a ▁sub species ▁of ▁the ▁sh y ▁al bat ross ) ▁are ▁sister ▁tax a , ▁and ▁more ▁dist antly ▁related ▁to ▁the ▁sh y . ▁ ▁Et ym ology ▁The ▁species ▁was ▁named ▁by ▁Lord ▁Lion el ▁Walter ▁Roth sch ild ▁for ▁the ▁distinguished ▁orn ith ologist ▁Os bert ▁Sal vin . ▁ ▁Description ▁ ▁The ▁Sal vin ' s ▁al bat ross ▁is ▁about ▁ ▁and ▁ ▁across ▁the ▁wings . ▁It ▁we igh s ▁ ▁and ▁is , ▁alongside ▁the ▁sh y ▁al bat ross , ▁the ▁largest ▁of ▁the ▁mol ly ma w k ▁or ▁small ▁al bat ross ▁group . ▁The ▁adult ▁bird ▁has ▁a ▁silver - gre y ▁crown . ▁Its ▁face , ▁upper ▁thro at , ▁and ▁upper ▁mant le ▁are ▁grey , ▁and ▁its ▁back , ▁upper wing , ▁and ▁tail ▁are ▁grey - black . ▁It ▁has ▁a ▁white ▁r ump ▁and ▁under parts ▁with ▁a ▁black ▁thumb mark ▁on ▁under wing ▁and ▁black ▁narrow ▁leading ▁and ▁trailing ▁edges ▁on ▁the ▁wing ▁and