▁for ▁many ▁mig rat ory ▁and ▁resident ▁bird ▁species . ▁The ▁UK ' s ▁largest ▁bre eding ▁population ▁of ▁pied ▁av oc ets ▁and ▁Su ff olk ' s ▁only ▁bre eding ▁Sand wich ▁t ern s ▁can ▁be ▁found ▁there . ▁Other ▁birds ▁found ▁on ▁the ▁island ▁include ▁o yst erc atch ers , ▁red sh anks , ▁ring ed ▁p lo vers , ▁golden ▁p lo ver , ▁d un lin , ▁gre ens h ank ▁and ▁turn st ones ▁as ▁well ▁w ige on , ▁pint ail ▁and ▁whe ate ars . ▁The ▁l ago ons ▁and ▁mar sh es ▁make ▁it ▁an ▁important ▁ro ost ing ▁and ▁feed ing ▁site ▁. ▁ ▁Bird s ▁of ▁pre y ▁including ▁short - eared ▁ow ls ▁and ▁mar sh ▁har riers ▁have ▁also ▁been ▁seen ▁hunting ▁over ▁the ▁island . ▁M amm als ▁on ▁the ▁island ▁include ▁m ice , ▁vol es ▁and ▁a ▁stable ▁population ▁of ▁around ▁ 2 9 ▁har es . ▁Common ▁se als ▁have ▁also ▁been ▁sp otted ▁in ▁the ▁river ▁around ▁the ▁island . ▁But ter fly ▁species ▁commonly ▁found ▁on ▁the ▁island ▁include ▁ski ppers , ▁small ▁co ppers , ▁walls , ▁me adow ▁brow ns ▁and ▁gate keep ers . ▁ ▁Conserv ation ▁ ▁Prote cted ▁status ▁▁ ▁Ha ver gate ▁Island , ▁together ▁with ▁the ▁National ▁Trust ▁managed ▁Or ford ▁N ess ▁site ▁is ▁a ▁designated ▁national ▁nature ▁reserve . ▁The ▁island ▁is ▁also ▁included ▁in ▁the ▁Al de - O re ▁Est u