. ▁ ▁Fe eding ▁Western ▁g ull s ▁feed ▁in ▁pel ag ic ▁environments ▁and ▁in ▁inter tid al ▁environments . ▁At ▁sea , ▁they ▁take ▁fish ▁and ▁in verte br ates ▁like ▁kr ill , ▁squ id ▁and ▁jel ly fish . ▁They ▁are ▁unable ▁to ▁d ive ▁and ▁feed ▁exclus ively ▁on ▁the ▁surface ▁of ▁the ▁water . ▁On ▁land ▁they ▁feed ▁on ▁se al ▁and ▁ ▁sea ▁l ion ▁car c ass es ▁and ▁road kill , ▁as ▁well ▁as ▁co ck les , ▁star fish , ▁lim p ets ▁and ▁sn ails ▁in ▁the ▁inter tid al ▁zone . ▁They ▁also ▁feed ▁on ▁human ▁food ▁refuse , ▁in ▁human - alter ed ▁habit ats ▁including ▁land fill s , ▁and ▁take ▁food ▁given ▁to ▁them , ▁or ▁st olen ▁from ▁people ▁at ▁mar inas , ▁be aches ▁and ▁par ks . ▁Western ▁g ull s ▁are ▁known ▁to ▁be ▁pre dat ory , ▁killing ▁and ▁e ating ▁the ▁young ▁of ▁other ▁birds , ▁especially ▁du ck lings , ▁and ▁even ▁the ▁adult s ▁of ▁some ▁smaller ▁bird ▁species . ▁Western ▁g ull s , ▁including ▁one ▁who ▁lived ▁at ▁Oak land ' s ▁Lake ▁Mer ritt ▁are ▁known ▁for ▁killing ▁and ▁e ating ▁p ige ons ▁( rock ▁do ves ). ▁ ▁They ▁will ▁also ▁sn atch ▁ ▁fish ▁from ▁a ▁c orm or ant ' s ▁or ▁pel ican ' s ▁mouth ▁before ▁it ▁is ▁sw allowed . ▁ ▁Re production ▁A ▁nest ▁of ▁veget ation ▁is ▁constructed