th ▁century . ▁Int rodu ced ▁go ats ▁were ▁also ▁responsible ▁for ▁de grad ation ▁of ▁the ▁environment . ▁By ▁the ▁end ▁of ▁the ▁ 1 9 0 6 ▁bre eding ▁season , ▁it ▁was ▁still ▁considered ▁" ab und ant ", ▁though ▁the ▁" large ▁numbers " ▁of ▁birds ▁present ▁there ▁and ▁then ▁must ▁have ▁been ▁nearly ▁the ▁entire ▁population ▁of ▁this ▁species . ▁Still , ▁it ▁was ▁noted ▁that : ▁ ▁the ▁mort ality ▁among ▁these ▁birds ▁from ▁the ▁dep red ations ▁of ▁the ▁c ats ▁that ▁over run ▁the ▁island ▁is ▁app alling ▁– ▁wings ▁and ▁fe athers ▁lie ▁scattered ▁in ▁every ▁direction ▁around ▁the ▁bur rows ▁along ▁the ▁top ▁of ▁the ▁p ine ▁r idge . ▁ ▁The ▁last ▁two ▁spec im ens ▁were ▁supposed ly ▁collected ▁between ▁May ▁ 2 ▁and ▁May ▁ 5 , ▁ 1 9 1 1 , ▁and ▁the ▁last ▁record ▁of ▁a ▁bre eding ▁bird ▁was ▁in ▁ 1 9 1 2 . ▁The ▁species ▁has ▁not ▁been ▁seen ▁since . ▁Only ▁old , ▁abandoned ▁bur rows ▁and ▁the ▁decay ed ▁remains ▁of ▁storm ▁pet rel s ▁killed ▁by ▁c ats ▁were ▁found ▁in ▁the ▁years ▁there after . ▁However , ▁the ▁Gu ad alu pe ▁storm ▁pet rel ▁cannot ▁be ▁distinguished ▁from ▁the ▁sym pat ric ▁O . ▁le uc or ho a ▁in ▁the ▁field , ▁and ▁surve ys ▁on ▁Gu ad alu pe ▁invari ably ▁took ▁place ▁outside ▁the ▁bre eding ▁season ▁of ▁O . ▁mac rod act y la