The Orange-crowned Warbler is one of the plainest warblers in North America — a drab, dingy olive-yellow bird with faint blurry streaks, no wing bars, and no bold markings, and its namesake orange crown patch is almost never visible, hidden beneath the olive feathers except in moments of excitement. That very plainness is the identification clue: a warbler with no obvious field marks, faint streaking, a thin pointed bill, and yellowish undertail coverts is likely this species. It is best learned by process of elimination.
Orange-crowned Warblers breed in shrubby habitats across the far north and west and pass through Michigan as migrants, notable for their timing: they are among the earliest warblers in spring and one of the latest in fall, lingering after most others have gone, often in weedy tangles and brushy edges. Hardier than most warblers, they take berries and even nectar in addition to insects, which helps them survive at the cold edges of the migration seasons. Their subtlety makes correctly naming one a small satisfaction.
Gleans insects and spiders from foliage in shrubs and low trees, and takes berries, fruit, and nectar as well, a flexible diet that lets it migrate early and late and survive cooler conditions. It forages actively in brushy tangles and weedy edges, often low, probing curled leaves and flower clusters.
Rarely. The orange crown patch is almost always concealed beneath the olive crown feathers, becoming visible only briefly when the bird is excited. Most Orange-crowned Warblers are identified without ever seeing it.
By its very lack of marks — a dingy olive-yellow warbler with faint blurry streaks, no wing bars, a thin pointed bill, and yellowish undertail coverts. Identification is largely by eliminating better-marked species.
As a migrant, notably early in spring and late in fall, often lingering in weedy tangles and brushy edges after most other warblers have passed. It breeds far to the north and west.
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