Prothonotary Warbler pairs share the in raising their young. But when it comes to construction of the nest, it is left almost entirely to the female. Here we see the female, discerned by the slightly darker feathers on the top of her head and nape of her neck, bringing nesting material to the cavity entrance. The male was occupying the cavity, but he yields to her as she brings pine needles that will build up the nest structure inside the cavity.

Location: Huntley Meadows Park, Fairfax County, Va.