ella ▁worth eni ▁can ▁range ▁in ▁length ▁from ▁ 1 2 . 5 ▁to ▁ 1 4   cm . ▁It ▁is ▁ident ifiable ▁by ▁its ▁distinct ive ▁head ▁pattern . ▁It ▁has ▁a ▁grey ▁head ▁with ▁a ▁r uf ous ▁crown , ▁a ▁brown ▁post oc ular ▁stri pe ▁and ▁a ▁p ink ▁bill . ▁It ▁has ▁grey - b rown ▁upper parts , ▁with ▁dark ▁brown ▁stre aks . ▁It ▁has ▁a ▁grey ▁bottom , ▁and ▁dark ▁brown ▁wings ▁and ▁tail . ▁Its ▁wings ▁are ▁" ed ged ▁pal er , ▁with ▁broad ▁wh it ish ▁to ▁pale ▁buff ▁wing - bar , ▁buff y - ruf ous ▁t ert ial ▁and ▁secondary ▁ed ging , ▁and ▁grey ish ▁less er ▁cover ts ". ▁ ▁Ju ven iles ▁are ▁character ized ▁by ▁brown ish ▁colour ation ▁of ▁the ▁head ▁and ▁ch est , ▁with ▁dus ky ▁stre aking ▁on ▁the ▁head ▁and ▁dark ▁brown ▁stre aking ▁on ▁the ▁ch est ▁and ▁fl anks . ▁ ▁The ▁song ▁is ▁a ▁dry , ▁ch ipping ▁tr ill ▁of ▁ 2 – 3 ▁seconds ▁duration ▁and ▁is ▁described ▁as ▁a ▁cross ▁between ▁that ▁of ▁the ▁field ▁sp arrow ▁and ▁that ▁of ▁the ▁ch ipping ▁sp arrow . ▁ ▁The ▁species ▁is ▁similar ▁in ▁appearance ▁to ▁the ▁field ▁sp arrow ▁( Sp iz ella ▁p us illa ). ▁However , ▁they ▁differ ▁in ▁pl um age , ▁habitat , ▁and ▁song . ▁ ▁The ▁species ▁n ests ▁from ▁May ▁to ▁July ▁and ▁usually ▁l ays