▁ke ana ▁surv ived ▁until ▁more ▁recently ; ▁relatively ▁well - pres erved ▁ske let ons ▁in ▁a ▁wet , ▁dynamically ▁active ▁cave ▁on ▁Mol ok ai ▁suggest ▁that ▁the ▁bat ▁may ▁have ▁surv ived ▁until ▁as ▁recently ▁as ▁a ▁few ▁thousand ▁years ▁ago . ▁ ▁Ext inction ▁Like ▁many ▁Hawai ian ▁birds , ▁the ▁ext inction ▁of ▁Syn empor ion ▁ke ana ▁may ▁have ▁been ▁caused ▁by ▁humans , ▁either ▁directly ▁or ▁indirect ly . ▁Possible ▁causes ▁of ▁its ▁ext inction ▁include ▁destruction ▁of ▁Hawai ian ▁low land ▁dry ▁for ests ▁and ▁introduction ▁of ▁pred ators ▁such ▁as ▁r ats . ▁ ▁See ▁also ▁ ▁List ▁of ▁ext inct ▁animals ▁of ▁the ▁Hawai ian ▁Islands ▁ ▁References ▁ ▁Category : F oss il ▁tax a ▁described ▁in ▁ 2 0 1 6 ▁Category : Fa una ▁of ▁Hawai i ▁Category : B ats ▁Category : M amm als ▁of ▁Hawai i ▁Category : P ale ont ology ▁in ▁Hawai i ▁Category : Hol oc ene ▁ext in ctions <0x0A> </s> ▁H arden ▁Sid ney ▁Mel ville ▁( 1 8 2 4 - 1 8 9 4 ) ▁was ▁an ▁English ▁painter ▁and ▁dra ug ht s man . ▁He ▁received ▁a ▁medal ▁from ▁the ▁Society ▁of ▁Art ists ▁and ▁had ▁three ▁paint ings ▁hung ▁in ▁the ▁Royal ▁Academy ’ s ▁show ▁between ▁ 1 8 3 7 ▁and ▁ 1 8 4 1 . ▁He ▁conducted ▁the ▁first ▁official ▁hydro graph ic ▁survey ▁of ▁the ▁north - east ▁coast ▁of ▁Australia ▁in