▁and ▁narrow ▁border ed ▁be e ▁ha w k - m oth ▁( H em aris ▁t ity us ). ▁While ▁but ter fly ▁species ▁include ▁the ▁small ▁he ath ▁( Co en onym pha ▁pam ph ilus ), ▁p ear l - border ed ▁f rit ill ary ▁( B ol oria ▁eu ph ros y ne ) ▁and ▁small ▁p ear l - border ed ▁f rit ill ary ▁( B ol oria ▁sel ene ). ▁Be et les ▁found ▁in ▁the ▁valley ▁include ▁the ▁less er ▁silver ▁water ▁be et le ▁( H ydro ch ara ▁car ab o ides ) ▁and ▁one - gro oved ▁div ing ▁be et le ▁( B id ess us ▁un ist ri atus ). ▁There ▁are ▁also ▁sh ining ▁ram ' s - horn ▁sn ails ▁( Seg ment ina ▁nit ida ) ▁and ▁shr ill ▁card er ▁be es ▁( B omb us ▁s yl var um ). ▁ ▁The ▁River ▁Br ue ▁and ▁its ▁trib ut aries ▁support ▁a ▁population ▁of ▁European ▁e els ▁( Ang u illa ▁an gu illa ). ▁Re pt iles ▁found ▁include ▁the ▁European ▁ad der ▁( V i per a ▁ber us ) ▁and ▁grass ▁s nake ▁( N at rix ▁nat rix ). ▁Multiple ▁bird ▁species ▁include ▁Bew ick ' s ▁sw an ▁( C yg n us ▁col umb ian us ▁be wick ii ), ▁E uras ian ▁bit tern ▁( B ota urus ▁stell aris ), ▁E uras ian ▁b ull fin