ish - ch est nut ▁or ▁o live ▁brown , ▁with ▁pal er ▁sides ▁and ▁bel ly . ▁M ales ▁and ▁females ▁are ▁about ▁the ▁same ▁size , ▁which ▁is ▁common ▁among ▁sh rew s ▁in ▁general . ▁Also ▁like ▁other ▁sh rew ▁species , ▁B air d ' s ▁sh rew ▁fe eds ▁on ▁insect s , ▁w orm s , ▁sn ails , ▁and ▁sp iders . ▁It ▁shares ▁the ▁for ests ▁of ▁its ▁range ▁with ▁six ▁other ▁species ▁of ▁sh rew , ▁such ▁as ▁the ▁Pacific ▁sh rew . ▁Body ▁length ▁ranges ▁from ▁ 1 0 0 ▁to ▁ 1 4 3   mm , ▁with ▁an ▁average ▁weight ▁of ▁ 7 . 6 ▁g , ▁but ▁r anging ▁anywhere ▁from ▁ 5 . 5 ▁to ▁ 1 1 . 2 ▁g . ▁ ▁Sub species ▁▁ ▁B air d ' s ▁sh rew ▁has ▁two ▁sub species : ▁S ore x ▁b air di ▁b air di , ▁( Mer ri am , ▁ 1 8 9 5 ) ▁Type ▁local ity : ▁" O regon , ▁Cl ats op ▁County , ▁Ast oria " ▁S ore x ▁b air di ▁perm ili ensis , ▁( Jack son , ▁ 1 9 1 8 ). ▁Type ▁local ity : ▁" Perm ilia ▁Lake , ▁W ▁base ▁M t . ▁Jefferson , ▁Cas cade ▁Range , ▁Mar ion ▁Co ., ▁Oregon ." ▁ ▁See ▁also ▁ ▁List ▁of ▁m amm als ▁of ▁Oregon ▁ ▁References ▁▁ ▁Don ▁E . ▁Wilson