Black Swift

The Black Swift (Cypseloides niger) is a highly aerial and enigmatic bird, famed for its mysterious lifestyle and remote nesting habits. As the largest swift in North America, it spends almost its entire day high in the sky, foraging for insects over vast distances. It is uniquely adapted for a life on the wing, characterized by long, slender, scythe-like wings and a dark, soot-colored plumage. For many years, its breeding habits remained a secret until naturalists discovered its preference for damp, shadowed cliffs, often directly behind or adjacent to rushing waterfalls. Today, it is a highly sought-after species by birdwatchers because of its elusive nature and spectacular nesting locations.

Identifying a Black Swift requires looking at both silhouette and flight style:

• Size & Shape: It is notably larger and broader-winged than the Vaux's Swift or Chimney Swift. Its wings are long, slender, and curved like a crescent moon (scythe-shaped).
• Plumage: The plumage is entirely blackish-gray or dark soot color. In excellent light, adults may show a slight pale frosting on the forehead and face, and some faint white scaling on the belly (particularly juveniles).
• Tail: The tail is relatively long and slightly notched or square-tipped, unlike the spine-tipped tails of Chaetura swifts. They often flare their tail, showing a distinct fork.
• Flight Style: Unlike the rapid, erratic "twinkling" flight of smaller swifts, the Black Swift has a more powerful, direct, and deliberate flight. It alternates deep, slow wingbeats with long, graceful glides.
• Similar Species: The White-throated Swift has a highly contrasting white belly and throat. Vaux’s Swift is much smaller, lighter gray-brown underneath, and has short, rapid wingbeats.

Breeding Habitat: Black Swifts have highly specialized breeding requirements. They nest on wet, vertical rock faces in deep mountain canyons, sea caves, and gorges, most famously behind or immediately next to waterfalls where the air is constantly cool and moist.

Geographic Range: Their breeding range extends from southeastern Alaska and western Canada down through the rugged mountains of the western United States (including Washington, Oregon, California, Colorado, and Utah) into Mexico, Central America, and the Caribbean.

Migration: Black Swifts are long-distance neotropical migrants. For decades, their wintering grounds were a mystery, but geolocator technology recently revealed they winter in the southern Amazon basin, primarily in western Brazil. They leave their breeding grounds in late summer and return in late spring.

Daily Activity: Black Swifts are strictly aerial, feeding, drinking, and even bathing on the wing. They forage at extreme altitudes, often rising thousands of feet into the air, making them difficult to detect from the ground except during overcast or stormy weather when low pressure forces insects—and the swifts—lower to the earth.

Feeding: They are aerial insectivores, feeding primarily on flying ants (particularly during nuptial flights), beetles, flies, and true bugs. They often travel dozens of miles daily from their nests to find productive foraging areas.

Vocalizations: They are generally quiet birds, but near nesting colonies or when interacting in flight, they emit a soft, dry clicking sound or a rapid series of high-pitched chips: tip-tip-tip-tip-tip.

Nesting: They lay a single white egg in a nest constructed of moss, ferns, and mud, cemented together on a ledge. Because of the cold, damp environment, the incubation and nestling periods are unusually long for a bird of its size, lasting up to two months.