Young birds are browner above, have yellower underparts, and a duller indistinct head pattern. Other variations include a redder or yellower pigment with the occasional purple-brown color. They have dull ginger-olive plumage, but are yellower on the wings, and paler below. The juveniles are similar to the adults but browner above and yellower below. In the females, the crown is duller and yellower. Living louse eggs tend to be pale whitish, whereas dead louse eggs are yellower. Unfortunately this off shore sand was much coarser and yellower being harder and grittier. Differences include juveniles having black splotched wings and a yellower bill. The Mexican Army wore a yellower shade of khaki than the Confederate butternut. Morphotype 2 has an intense purple sheen and yellower leg rings. The sexes are identical, as with most warblers, but young birds are yellower below. The female is generally more green, the male much yellower. As the age of the person increases, the teeth can also appear yellower over time. Generally, the bohor reedbuck is yellower than other reedbucks. Western birds are yellower than eastern birds.