▁as ▁the ▁" oc cip ital ▁face ". ▁It ▁has ▁a ▁grey ish - b rown ▁pale - sp otted ▁p ector al ▁band ▁on ▁upper ▁breast ▁and ▁la cks ▁ear - tu ft s . ▁You ▁can ▁see ▁its ▁tail ▁when ▁in ▁flight , ▁longer ▁than ▁most ▁pyg my ▁ow ls , ▁and ▁has ▁rapid ▁wing be ats . ▁ ▁Col our ▁morph s ▁ ▁Col la red ▁ow lets ▁transition ▁through ▁various ▁age - dependent ▁colour ▁morph s . ▁A ▁capture - re capt ure ▁study ▁of ▁col la red ▁ow lets ▁in ▁Taiwan ▁provided ▁evidence ▁of ▁this . ▁On ▁the ▁first ▁capture , ▁the ▁individual ▁was ▁ 5 6 ▁days ▁old ▁and ▁showed ▁fled g ling ▁colour ▁morph ▁stage ; ▁having ▁less ▁sp ots ▁and ▁bar ring ▁on ▁the ▁back ▁and ▁top ▁of ▁the ▁head ▁and ▁not ▁having ▁a ▁completely ▁formed ▁oc cip ital . ▁On ▁the ▁second ▁re capt ure , ▁the ▁individual ▁was ▁captured ▁ 1 6 5 ▁days ▁after ▁h atch ing ▁and ▁demonstrated ▁a ▁r uf ous ▁morph ; ▁having ▁an ▁overall ▁orange - red ▁colour , ▁bar red ▁back , ▁sp ots ▁on ▁the ▁head ▁and ▁a ▁formed ▁oc cip ital . ▁On ▁the ▁third ▁re capt ure , ▁the ▁individual ▁was ▁ 3 9 4 ▁days ▁old ▁and ▁was ▁in ▁its ▁final ▁grey ▁morph . ▁ ▁V ocal izations ▁ ▁The ▁col la red ▁ow let ▁has ▁very ▁unusual ▁but ▁distinct ive ▁vocal izations . ▁The ▁male ▁produces ▁a ▁ 4 - note ▁phrase