A broad black mask lends a touch of highwayman’s mystique to the male Common Yellowthroat. Look for these furtive, yellow-and-olive warblers skulking through tangled vegetation, often at the edges of marshes and wetlands. Females lack the mask and are much browner, though they usually show a hint of warm yellow at the throat. Yellowthroats are vocal birds, and both their witchety-witchety-witchety songs and distinctive call notes help reveal the presence of this, one of our most numerous warblers.