Common nighthawks hunt the summer dusk

The air above Frankford holds its heat as the longest day fades toward night. In this threshold hour, when the last commuters have passed and the streetlights have not yet claimed the sky, a different hunter takes the airspace. The common nighthawk cuts through the warm air with angular wings, its white patches flashing as it banks and dives after insects that rise from the pavement and rooftops below.

This bird is built for aerial pursuit. Its wide mouth opens like a net, fringed with bristles that help funnel flying insects into its throat. The nighthawk does not perch and wait. It patrols the air above Baltimore's neighborhoods, quartering back and forth in long, steady sweeps thirty to sixty feet above the ground. When it spots prey, the chase is swift and direct. Wings fold partially back, the bird accelerates, mouth opens wide. Most hunts end in a quick snap of the bill and a return to the patrol route.

The insects that fill summer evenings provide abundant fuel for this hunting strategy. Flying ants emerge from sidewalk cracks in warm weather, their wings catching the last light as they disperse to establish new colonies. Beetles lumber through the air between streetlamps. Mosquitoes and midges rise in clouds from any standing water, while moths begin their own nocturnal flights. The nighthawk takes them all, but timing matters. Too early in the evening and the light is still too bright for many insects to emerge. Too late and the bats claim the airspace. The nighthawk hunts in the narrow window when aerial insects are active but visibility remains good.

This species arrives in Baltimore only for the breeding season, drawn by the abundance of flat rooftops that substitute for the rocky ground where it traditionally nests. Urban areas offer something the original prairie habitat cannot: concentrated insect populations drawn to artificial lights and heat-absorbing surfaces. A single bird may consume hundreds of insects in an evening hunt, timing its flights to coincide with peak insect activity. The longer days of early summer extend hunting time, allowing parent birds to gather enough food for themselves and their young. By late August, when insect populations begin to wane and daylight shortens, the nighthawks will have already started their migration south, following the abundance they depend on.

Listen now for the sharp call that cuts through the evening air, a nasal peent that announces the nighthawk's presence overhead. The sound carries farther than you might expect in the still air, marking the territory of a bird that claims the entire sky above the neighborhood as its hunting ground.