page_title: Sand martin
section_title: Ecology
hierarchical_section_title: Sand martin / Ecology
caption_attribution_description: Deutsch: Uferschwalbe English: Sand Martin
context_page_description: The sand martin or European sand martin, bank swallow in the Americas, and collared sand martin in India, is a migratory passerine bird in the swallow family. It has a wide range in summer, embracing practically the whole of Europe and the Mediterranean countries and across the Palearctic to the Pacific Ocean. It is a Holarctic species also found in North America. It winters in eastern and southern Africa, South America, and the Indian Subcontinent.
context_section_description: Linnaeus already remarked on this species' breeding habits: Habitat in Europae collibus arenosis abruptis, foramine serpentino—"it lives in Europe, in winding holes in sheer sandy hills". It has been observed that sand martins favour loess as a particular type of ground to nest in. Sand martins are generally found near larger bodies of water, such as rivers, lakes or even the ocean, throughout the year.
  In Britain, the sand martin appears on its breeding grounds as the first of its family, starting towards the end of March, just in advance of the barn swallow. In northern Ohio, they arrive in numbers by mid-April, about 10 days earlier than they did 100 years ago. At first, they flit over the larger bodies of water alone, in search of early flies. Later parties accompany other swallow species, but for a time, varying according to weather, the birds remain at these large waters and do not visit their nesting haunts. The sand martin departs early, at any rate from its more northerly haunts. In August, the gatherings at the nightly roost increase enormously, though the advent and departure of passage birds causes great irregularity in numbers. They are essentially gone from their breeding range by the end of September.
  The food consists of small insects, mostly gnats and other flies whose early stages are aquatic.
  The sand martin is sociable in its nesting habits; from a dozen to many hundred pairs will nest close together, according to available space. The nests are at the end of tunnels of from a few inches to three or four feet in length, bored in sand or gravel. The actual nest is a litter of straw and feathers in a chamber at the end of the burrow; it soon becomes a hotbed of parasites. Four or five white eggs are laid about mid-late May, and a second brood is usual in all but the most northernly breeding sites.
  This is not a rare bird, and it is classified as a species of least concern by the IUCN. It does have some local protections, as certain populations have declined or face threats from habitat loss and fragmentation. They are considered threatened in California, where populations exist in the Sacramento Valley and at two coastal sites, Año Nuevo State Park and Fort Funston.
caption: Active breeding colony
exif: {"Image Make": "Canon", "Image Model": "Canon EOS 40D", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS2 Windows", "Image DateTime": "2008:05:04 21:42:25", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "232", "GPS GPSVersionID": "[2, 2, 0, 0]", "Image GPSInfo": "1000", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1114", "Thumbnail JPEGInterchangeFormatLength": "11489", "EXIF ExposureTime": "1/160", "EXIF FNumber": "28/5", "EXIF ExposureProgram": "Aperture Priority", "EXIF ISOSpeedRatings": "250", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2008:05:04 20:13:06", "EXIF DateTimeDigitized": "2008:05:04 20:13:06", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "59/8", "EXIF ApertureValue": "5", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "400", "EXIF SubSecTime": "99", "EXIF SubSecTimeOriginal": "99", "EXIF SubSecTimeDigitized": "99", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2276", "EXIF ExifImageLength": "1836", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "968", "EXIF FocalPlaneXResolution": "324000/73", "EXIF FocalPlaneYResolution": "2592000/583", "EXIF FocalPlaneResolutionUnit": "2", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard"}