This is one of the most inconspicuous, blandest bird species found in Iowa. Bell’s Vireos inhabit thick stands of low shrubs and trees, often along or near water. The sound of the bubbly song of the male Bell’s Vireo is usually the only way that one is aware that this species is present. The singing male typically stays out of sight within the thick cover, and most observers, after hearing the bird, leave without getting more than perhaps a quick glimse of a small, olive-colored bird. Bell’s Vireo seems to never occur in great numbers and because of its specific habitat needs, is spread over the countryside. The tendency to clear out roadside brush and similar cover has probably reduced the amount of suitable habitat for it. It also is a species that seems to be very susceptible to cowbird parasitism.
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indicates a designated IBA.