Black-and-white Warbler

Mniotilta varia
Parulidae

Male in breeding plumage
Male sings to establish territory
Male striped in black and white overall
Female in fresh breeding plumage
Female has white throat and grayish ear patch
Underparts of female slightly beige
Female with posture of nuthatch
Female with larva pried from bark
Recent hatchlings totally helpless
Female at nest
Immature female on wintering ground
Immature male with blackening throat

More slender and smaller than a House Sparrow, the Black-and-white Warbler has a distinctive black and white plumage.  

Unlike the other warblers, it creeps along tree trunks or large branches looking for insects sheltered in the crevices of tree bark such as bark beetles, click beetles or wood borers, insects that are detrimental to tree health.  Various caterpillars including those of gypsy moths, ants, flies, leafhoppers, and spiders are also fair game.  It has been seen foraging along the Upland and Pond trails at Salter Grove during spring migration.