Common nighthawks hunt the summer dusk
June 4, 2026
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.
Fireflies signal through the short summer nights
June 25, 2026
The light is still fading at nine o'clock. In the understory along Bethesda's wooded edges, where flowering dogwood and pawpaw hold the middle layer and the canopy closes overhead, the first flashes appear low to the ground, maybe a foot or two above the grass. They are yellow-green, brief, and arcing slightly upward. By the time full dark settles in, there are dozens of them.These are common eastern fireflies, and what you are watching is a conversation. The males fly and flash; the females wait, perched on vegetation, watching. The male's signal follows a precise pattern: a single flash lasting about half a second, then a pause of roughly six seconds, then another flash. The arc of the flight is part of it too. Females who are ready to mate flash back after a fixed delay, typically about two seconds. That timing is the key. Males scanning the dark learn to read it. A female who answers at the right interval draws the male toward her, and he flashes again, and she answers again, and he homes in. The whole exchange can take several minutes before the male lands.This is peak season for them. The nights are the shortest they will be all year, which means the window for signaling is compressed. But the warmth matters as much as the darkness. Common eastern fireflies are most active when air temperatures stay above roughly 21 degrees Celsius after sunset, and summer nights here hold that heat. The flashing typically begins in the first hour after dark and tapers off by midnight. On a warm, still night with low wind, the signals carry well and the activity is dense. On cooler nights, or nights with rain, it falls away quickly.The light itself is produced in the abdomen, in a specialized organ that runs a chemical reaction involving a compound called luciferin, an enzyme called luciferase, and oxygen. The reaction produces light with almost no heat, which is unusual for a light-producing process. The firefly controls the flash by controlling the oxygen supply to the organ. The precision of the timing, the duration, the interval, is all physiological, controlled by the nervous system. Different firefly species in the same habitat use different flash patterns and different colors, which is how a female tells her own species from others flying nearby. In the same meadow edge, you might have several species active at once, each running a different signal.The larvae spend most of their lives underground or in leaf litter, where they are predators of soft-bodied invertebrates including earthworms and snails. The adult firefly, the one flashing now, does not eat at all, or eats very little. The adult stage is entirely about reproduction. The females of some firefly species mimic the flash responses of other species to lure males and eat them, but common eastern fireflies do not do this. The adults live only a few weeks.
