Common Nighthawk

Overview

The common nighthawk (Chordeiles minor) is a long-winged, aerial insectivore that looks — and flies — nothing like a hawk. The name is an old misnomer: it is a member of the nightjar family, a group of cryptically patterned, crepuscular and nocturnal birds with wide, gaping mouths optimized for catching insects on the wing. The common nighthawk is distinctive in the family for its pointed, falcon-like wings and the bold white bar across each primaries — visible in flight even at distance.

Adults are brown-grey with intricate camouflage patterning on the upperparts, near-invisible when roosting horizontally on a branch or on the ground. In flight they are unmistakable: erratic, buoyant wingbeats, white wing patches flashing, and frequent course-reversals as they chase insects.

Why Tortuguero

Tortuguero sits directly on one of the major Caribbean-coast corridors for boreal migrants moving between North and South America. Common nighthawks funnel through the coastal lowlands in substantial numbers — sometimes in loose aggregations of dozens of birds — during the September–October southbound migration. The open airspace over the beach, the Tortuguero lagoon, and the broad lower canal reaches provide exactly the insect-rich aerial hunting ground they use on stopover.

The species is also a productive ecological indicator: nighthawk numbers vary with insect abundance, which is itself a measure of the aquatic productivity of the canal system below them.

How to see them (honestly)

• Watch the sky at dusk, especially over the beach or the lagoon edge, during September–October and March–April
• The white primary bar is the field mark — it disappears on most birds in direct overhead light and flares when backlit or in low-angle light
• Migrating flocks may be loose and spread over a wide area; scan broadly rather than focusing on one spot
• At rest they are nearly invisible; do not expect to find a roosting bird without a guide who knows the exact roost sites

Status note

The IUCN lists the common nighthawk as Least Concern globally, but North American survey data show a declining trend in breeding populations — attributable to reduced insect abundance, urban light pollution affecting migration, and habitat changes on wintering grounds. Tortuguero provides a clean, low-light-pollution airspace corridor, which matters for a species with known sensitivity to artificial light during migration.