Common Swift (Apus apus) lives in open sky and urban building across Europe, Africa, and Asia. It feeds on insects and spiders. Its conservation status is Least Concern.
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Some common swifts can stay aloft for ten months straight, never touching ground. Their ultra-short legs are only for clinging to walls, so they avoid landing where predators wait. This extreme aerial lifestyle shows how evolution can push a bird to live almost entirely in the sky, making it the ultimate airborne survivor.
A single swift can reach a horizontal speed of 111.6 km/h (69.3 mph) during flight. That is faster than a city bus on a highway and lets them chase swarms of insects across open fields. Such speed helps them capture enough food to fuel their months-long migrations without stopping.
During summer evenings, 10-20 swifts gather in "screaming parties" that rise together at dusk, while at dawn they disperse into separate streams. Radar studies suggest these coordinated climbs share cues about food and safe routes. The behaviour reveals a sophisticated social network that boosts survival in a constantly moving world.
Swifts build nests from airborne debris glued with saliva, often in old woodpecker holes, 600 of which were recorded in Poland's Białowieża Forest. When ancient forests disappear, they adapt to eaves and window gaps in buildings. This flexibility shows how a species can persist despite losing its traditional habitat, but also highlights the need to protect nesting sites.
Geolocator data showed swifts breeding in Sweden spend three to three-and-a-half months wintering in the Congo, then fly back, spending the rest of the year on the wing. Their migration follows rivers and low-pressure fronts, using insect-rich corridors like the Great Rift Valley. Understanding these routes is vital for conserving the stop-over habitats that fuel their epic journeys.
Sources
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As the sun sets over the cityscape, a dark, sleek form darts through the fading light, the Common Swift a mesmerizing blur of motion as it chases the day's last insects with reckless abandon, its scythe-like wings beating at a hypnotic pace. With a lifetime spent almost entirely on the wing, this remarkable bird has evolved to ride the wind and thermal currents with effortless ease, its slender body a masterpiece of aerodynamic design. In its element, the Swift is a whirlwind of energy and agility, a true marvel of nature that weaves and dodges with incredible precision through the urban canyons it calls home.
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