Birds of North America Illustrations

Chestnut-sided Warbler: Medium-sized warbler with black-streaked upperparts, white underparts, and chestnut-brown flanks. Cap is bright yellow and moustache stripe is black. Female has less chestnut-brown on flanks. Winter adult and juvenile have lime-green upperparts, conspicuous yellow eye-ring, dark gray wings with two yellow bars, and gray underparts.