Wilson's Warbler Pictures (Wilsonia pusilla).
Wilson's Warbleris also a tropical migratory bird. In the summer months it can be found throughout Northern North America from coast to coast, sometimes ranging down as far as New Mexico. Wilson's Warbler is also a small yellow songbird, not even 5 inches in length. The male has a bright yellow face and belly, but olive green upperparts and wings. It has a long brown tail and a black cap on top of its head. The female is similar in coloring, but have an olive-gray coloring on her head.
Wilson's Warblers eat berries, spiders and insects, which it can catch in mid-flight. They have vastly different breeding habits, depending on location. They are monogamous birds who are often found alone, especially in coastal areas. They can be found in pairs as well. In high elevations these birds are polygynous. Perhaps the lack of air confuses them in identifying their mate. ;) They have one brood of 4-7 eggs per year. They prefer dense woodlands, bogs and areas with good ground cover.