Bank Swallow (Riparia riparia) lives in open areas near water across Europe, Mediterranean, northern Asia, North America. Its conservation status is Least Concern.
Hear the Bank Swallow
A real field recording of the Bank Swallow, made in the wild.
Sand martins fit into a pocket-sized package: they measure just 12-13 cm from tip to tail, spread their wings to a modest 26.5-29 cm, and tip the scales at only 11-16 g, swelling to as much as 19.5 g before they head south. Short enough to slip into the narrow crevices of riverbanks where they dig their homes. Their tiny mass lets them dart over water, snatching insects mid-flight.
In Britain the sand martin is the first swallow to set foot on its breeding grounds, arriving from the middle of March, a week or two ahead of its cousin the barn swallow. In northern Ohio they now show up by mid-April, about 10 days earlier than they did a century ago.
Male sand martins start digging the tunnel the moment they land, carving a straight shaft perpendicular to the bank that averages 58.8 cm long. Once the tunnel reaches about 30 cm they begin singing, and the pair soon fills the end chamber with a nest of straw and feathers. The female then lays a clutch of usually four or five white eggs, the species can lay from 1 to 9, but most nests hold 4-5, and both parents share incubation for 13-16 days before the chicks hatch and fledge about 20 days later. This rapid, cooperative breeding cycle lets them raise two broods in a single summer where conditions allow.
Sand martins are gregarious, nesting in colonies that can swell from a dozen pairs to several hundred. Living in larger groups isn't just social, it gives them a safety net. Colonies with many birds are more successful at spotting and fending off diurnal avian predators, because many eyes can spot a hawk or kestrel faster than a solitary pair.
A single sand martin's diet is almost pure protein: stomach-content analysis found 99.8 % of what they eat are insects, with roughly a third (33.5 %) being ants, bees and wasps, a quarter (26.6 %) flies, and the rest split among beetles (17.9 %), mayflies (10.5 %), bugs (8 %), dragonflies (2.1 %) and a smattering of moths and butterflies (1.2 %). By sweeping swarms of these pests from wetlands, fields and riverbanks, sand martins act as natural pest control agents, helping to keep mosquito and crop-insect populations in check while they refuel on the wing.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
RangeEurope, Mediterranean, northern Asia, North America
HabitatOpen areas near water
DietInsects & spiders
About the Bank Swallow
As the sun rises over the sandy banks of a winding river, a tiny, iridescent form darts and weaves through the air, its rapid wingbeats a blur as the Bank Swallow pursues its insect prey with reckless abandon. With a nimbleness that belies its small size, this diminutive bird navigates the intricate labyrinth of burrows and tunnels it calls home, its agility and speed allowing it to thrive in a world of treacherous currents and shifting sands. In its effortless, aerodynamic glide, the Bank Swallow embodies the very essence of fluid motion, a fleeting glimpse of perfection in the whirlwind of life.
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