▁three ▁or ▁four ▁eggs . ▁Single - species ▁f lock s ▁form ▁after ▁the ▁bre eding ▁season ▁and ▁are ▁strongly ▁attract ed ▁to ▁permanent ▁sources ▁of ▁water . ▁ ▁The ▁species ▁is ▁not ▁mig rat ory ; ▁however , ▁a ▁few ▁sight ings ▁of ▁individuals ▁have ▁taken ▁place ▁throughout ▁the ▁north western ▁region ▁of ▁Mexico . ▁Only ▁one ▁individual ▁has ▁ever ▁been ▁identified ▁( shot ) ▁in ▁the ▁United ▁States , ▁and ▁it ▁was ▁by ▁R ie ber ▁on ▁June ▁ 1 6 , ▁ 1 8 8 4 , ▁near ▁Silver ▁City , ▁New ▁Mexico . ▁This ▁individual , ▁the ▁first ▁of ▁the ▁species ▁to ▁be ▁described , ▁is ▁the ▁type ▁spec imen . ▁ ▁Hab itat ▁and ▁range ▁ ▁W orth en ' s ▁sp arrow ▁is ▁en demic ▁to ▁n ort he astern ▁Mexico ▁and ▁currently ▁occup ies ▁a ▁ 2 5   km 2 ▁range . ▁Pop ulations ▁formerly ▁occurred ▁in ▁Z ac ate cas , ▁Co ahu ila , ▁Nue vo ▁León , ▁and ▁T ama ul ip as ; ▁however , ▁presently ▁it ▁is ▁only ▁known ▁to ▁occur ▁from ▁sout he astern ▁Co ahu ila ▁to ▁western ▁Nue vo ▁León . ▁ ▁Sp iz ella ▁worth eni ▁pre fers ▁open , ▁ar id ▁shr ub - gr ass land ▁at ▁elev ations ▁of ▁. ▁For ▁for aging , ▁the ▁species ▁pre fers ▁open ▁areas ▁with ▁low ▁grass es . ▁For ▁nest ing ▁and ▁cover , ▁it ▁usually ▁inhab its ▁low , ▁dense ▁shr ubs . ▁ ▁As