Isthmus of Panama = Lion Hill, Canal Zone.
Previously considered conspecific with Z. improbus, and until recently with Z. vilissimus#R. Differs from latter in its smaller size (effect size for wing −2.89, score 2); slightly paler, more greyish crown (1); narrow, less obvious supercilium (1); less marked and less yellow flammulations on lower underparts (1); and song with longer note length (at least 2) and much less frequency drop (2)#R. Monotypic.
Honduras and E Nicaragua S to Panama and extreme NW Colombia (NW Chocó).
Food and feeding
Status and conservation
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