▁( M icro h ier ax ▁fr ing ill arius ) ▁is ▁one ▁of ▁the ▁smallest ▁birds ▁of ▁pre y , ▁typically ▁meas uring ▁between ▁ ▁long , ▁with ▁a ▁ ▁wings pan , ▁which ▁is ▁a ▁size ▁compar able ▁to ▁a ▁typical ▁sp arrow . ▁It ▁is ▁native ▁to ▁Br une i ▁Dar uss al am , ▁My an mar , ▁Th ailand , ▁Malays ia , ▁Singapore ▁and ▁Indones ia . ▁and ▁v agrant ▁to ▁Sri ▁L anka . ▁ ▁Tax onomy ▁and ▁system at ics ▁ ▁Thomas ▁H ors field ▁described ▁to ▁the ▁Lin ne an ▁Society ▁of ▁London ▁in ▁ 1 8 2 0 ▁a ▁J avan ▁variety ▁of ▁Fal co ▁c ær ules c ens ▁( the ▁col la red ▁fal con et ). ▁He ▁noted ▁that ▁" the ▁J avan ▁spec im ens ▁are ▁somewhat ▁smaller , ▁and ▁differently ▁marked " ▁than ▁the ▁Beng al ▁spec imen ▁which ▁had ▁been ▁described ▁by ▁John ▁Edwards ▁in ▁ 1 7 5 0 . ▁ ▁A ▁full er ▁description ▁was ▁published ▁in ▁his ▁ 1 8 2 4 ▁book , ▁Zo ological ▁Research es ▁in ▁Java . ▁ ▁Also ▁in ▁ 1 8 2 4 , ▁D rap iez ▁published ▁the ▁name ▁Fal co ▁fr ing ill arius , ▁and ▁V ig ors ▁proposed ▁the ▁genus ▁Ier ax ▁or ▁Hier ax . ▁ ▁Description ▁This ▁is ▁a ▁minute , ▁sh rike - like ▁fal con , ▁with ▁a ▁squ ar ish ▁tail ▁that ▁is ▁frequently ▁spread . ▁ ▁The ▁adult