▁as ▁the ▁longest ▁bill ▁for ▁a ▁sand pi per . ▁ ▁The ▁Far ▁Eastern ▁cur le w ▁sp ends ▁its ▁bre eding ▁season ▁in ▁n ort he astern ▁Asia , ▁including ▁Si ber ia ▁to ▁ ▁Kam chat ka , ▁and ▁Mong olia . ▁Its ▁bre eding ▁habitat ▁is ▁composed ▁of ▁mar sh y ▁and ▁sw amp y ▁wet lands ▁and ▁la kes hor es . ▁Most ▁individuals ▁winter ▁in ▁coast al ▁Australia , ▁with ▁a ▁few ▁heading ▁to ▁South ▁Korea , ▁Th ailand , ▁Philippines ▁and ▁New ▁Zealand , ▁where ▁they ▁stay ▁at ▁est u aries , ▁be aches , ▁and ▁salt ▁mar sh es . ▁During ▁its ▁migration ▁the ▁Far ▁Eastern ▁cur le w ▁commonly ▁passes ▁the ▁Y ellow ▁Sea . ▁ ▁It ▁uses ▁its ▁long , ▁dec ur ved ▁bill ▁to ▁pro be ▁for ▁in verte br ates ▁in ▁the ▁mud . ▁It ▁may ▁feed ▁in ▁solit ary ▁but ▁it ▁generally ▁con greg ates ▁in ▁large ▁f lock s ▁to ▁migr ate ▁or ▁ro ost . ▁Its ▁call ▁is ▁a ▁sharp , ▁clear ▁wh ist le , ▁cu u ue - ree e , ▁often ▁repeated . ▁ ▁As ▁of ▁ 2 0 0 6 , ▁there ▁are ▁an ▁estimated ▁ 3 8 , 0 0 0 ▁individuals ▁in ▁the ▁world . ▁Form er ly ▁class ified ▁as ▁least ▁concern ▁by ▁IU CN , ▁it ▁was ▁found ▁to ▁have ▁been ▁r ar er ▁than ▁previously ▁believed ▁and ▁thus ▁its ▁status ▁was ▁updated ▁to ▁V ul ner able ▁in ▁the ▁