istol och ic ▁acid . ▁The ▁lar va e ▁se quest er ▁the ▁to x in , ▁and ▁both ▁the ▁ju ven ile ▁and ▁adult ▁but ter f lies ▁have ▁high ▁and ▁to xic ▁concentr ations ▁of ▁the ▁ar istol och ic ▁acid ▁in ▁their ▁t issues . ▁Through out ▁the ▁range ▁of ▁the ▁species , ▁Batt us ▁phil en or , ▁other ▁but ter f lies ▁and ▁moth s ▁m im ic ▁the ▁distinct ive ▁color ation ▁of ▁the ▁sw allow tail ▁to ▁avoid ▁pred ators . ▁However , ▁there ▁are ▁no ▁known ▁m im ics ▁of ▁the ▁Californ ian ▁sub species . ▁ ▁Return ▁to ▁San ▁Francisco ▁The ▁species ' ▁presence ▁was ▁dr ast ically ▁reduced ▁in ▁San ▁Francisco , ▁but ▁was ▁being ▁brought ▁back ▁as ▁of ▁ 2 0 1 7 . ▁ ▁References ▁ ▁phil en or ▁Category : But ter f lies ▁of ▁the ▁United ▁States ▁Category : End em ic ▁fa una ▁of ▁California ▁Category : Fa una ▁of ▁the ▁California ▁chap ar ral ▁and ▁wood lands ▁Category : Fa una ▁of ▁the ▁San ▁Francisco ▁Bay ▁Area ▁Category : N atural ▁history ▁of ▁the ▁Central ▁Valley ▁( Cal iforn ia ) ▁~ ▁Category : But ter fly ▁sub species <0x0A> </s> ▁John ▁F oster ▁may ▁refer ▁to : ▁▁ 1 5 th / 1 6 th / 1 7 th - century ▁polit icians ▁ ▁John ▁F oster ▁( MP ▁for ▁Br istol ), ▁ 1 5 th - century ▁MP ▁for ▁Br istol ▁John ▁F oster