Chestnut-sided Warbler

 

The Chestnut-sided Warbler is a slim warbler with a relatively long tail that it often holds cocked, or raised above the body line, which makes the tail appear longer still.

Breeding adults are crisp gray-and-white birds with a yellow crown, black face markings, and rich chestnut flanks. Males are more richly marked than females.

Chestnut-sided Warblers flit and hop along slender branches, carefully inspecting the undersides of deciduous leaves. Look for them in saplings and shrubs more often than in tall trees. They often raise the tail and droop the wings as they move through the branches. Cornell All About Birds