ig and i , ▁is ▁found ▁on ▁the ▁island ▁of ▁Pi per i . ▁ ▁G ig ant ism ▁and ▁polym orph y ▁The ▁Sky ros ▁wall ▁l izard ▁exhib its ▁island ▁gig ant ism ▁on ▁small ▁is lets ▁surrounding ▁Sky ros . ▁The ▁Sky ros ▁wall ▁l izard ▁also ▁exhib its ▁a ▁thro at ▁color ▁polym orph y ▁with ▁six ▁different ▁thro at ▁color ▁morph s ▁that ▁are ▁expressed ▁in ▁both ▁females ▁and ▁males . ▁ ▁Et ym ology ▁The ▁specific ▁name , ▁ga ige ae , ▁is ▁in ▁honor ▁of ▁American ▁her pet ologist ▁Helen ▁Be ul ah ▁Thompson ▁Ga ige . ▁ ▁Description ▁The ▁Sky ros ▁wall ▁l izard ▁reaches ▁a ▁sn out - to - vent ▁length ▁( SV L ) ▁of ▁about ▁. ▁It ▁has ▁a ▁deep ▁head ▁and ▁a ▁tail ▁approximately ▁twice ▁the ▁length ▁of ▁the ▁body . ▁The ▁colour ing ▁is ▁rather ▁variable , ▁usually ▁being ▁green , ▁o live - green , ▁or ▁brown ish , ▁with ▁a ▁dark ▁verte br al ▁band ▁and ▁dor so - l ater al ▁stri pes . ▁The ▁m ott led ▁fl anks ▁often ▁have ▁a ▁single ▁blue ▁spot ▁above ▁the ▁shoulder . ▁The ▁under parts ▁are ▁white , ▁often ▁with ▁dark ▁sp ots ▁on ▁the ▁thro at , ▁the ▁l iz ards ▁on ▁each ▁island ▁having ▁characteristic ▁mark ings . ▁ ▁Distribution ▁The ▁Sky ros ▁wall ▁l izard ▁occurs ▁only ▁on ▁Sky ros ▁and ▁on ▁Pi per i ▁Island ▁in ▁the ▁Sp or ades ▁arch ip el ago