The findings of the study showed that the vegetation structure variables were divided into two groups representing old undisturbed forests and young or disturbed forests. The level of vegetation structures that is typically high or large in old undisturbed forests such as plot age, basal area, canopy layer, large stems, and woody plant diversity seems to be what impacts the composition of bird species and habitat guilds. Birds belonging to the forest specialist guild were more correlated to the variables associated with old undisturbed forests, while forest generalists were more correlated to variables typical of young or disturbed forests. Hence, old undisturbed forests seem to be of great importance for forest specialists, whereas young or disturbed forest seems to be enough to support forest generalists and visitors. This suggests that forest specialists would be most vulnerable to disturbance or loss of old forest. In order to protect forest specialists, threatened and endemic species, and ensure their future survival in the Kakamega forest, the human disturbance must be held at a low level.