General Description: Wilson's Warblers (Cardellina pusilla) are tiny, sexually dimorphic songbirds. Both genders are olive-green on the back and wings, bright yellow on the head and underparts, and have beady black eyes. Males are brighter overall and have a black cap; females are duller, and the cap is gray.

Taxonomy: Passeriformes, Parulidae. Formerly Wilsonia pusilla.

Favored Habitat: Riparian areas with trees and brushy thickets.

Where to Find: Around Las Vegas, expect to see Wilson's Warblers everywhere during migration when they are often the most abundant species of warbler. They mostly breed in the mountain brush thickets north of Las Vegas.

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