Swift vs Swallow vs House Martin: How to Tell Them Apart
Updated 6 October 2026
Side by side
| Feature | Swift | Swallow | House Martin | Sand Martin |
|---|---|---|---|---|
| Size | About 16 to 17 cm, with a wingspan of 42 to 48 cm. | About 17 to 19 cm with streamers. | About 12 cm. | About 12 cm. The smallest. |
| Key plumage | Sooty brown all over. Small pale throat. Looks black against the sky. | Glossy blue-black above. Dark red forehead and throat, dark chest band, cream below. | Blue-black above with a square white rump. Pure white below. | Sandy brown above. White below with a brown chest band. No white rump. |
| Structure | Long, narrow, stiff wings in a crescent. Short forked tail. | Long tail streamers, longest on adult males. | Compact. Short, neatly forked tail. | Slight. Shallow fork. |
| Flight | Fast and high. Bursts of stiff, flickering beats, then long glides. | Low and fluid over fields and water, with easy swoops. | Higher than Swallows. Fluttery, with short glides. | Light and jerky, usually low over water. |
| Song | None. | A fast, cheerful twitter with a dry rattle, often from a wire. | A soft, bubbly twitter. | A dry, scratchy chatter. |
| Call | A shrill, drawn-out scream. | A sharp "vit" or "vit-vit". | A dry "prrit". | A rasping "tschrr". |
| Nest | In holes under eaves and tiles, mostly on older buildings. | Open mud cup on a beam or ledge inside a barn, stable or porch. | Closed mud cup under the eaves, on the outside wall. | Tunnel dug into a sandy bank. |
| Habitat | Over towns and villages. Feeds anywhere, often high. | Farmland and villages, close to livestock and open sheds. | Towns and villages, often near water. | Rivers, lakes and gravel pits. |
| When in the UK | Late April or early May to August, with stragglers into September. | Late March and April to September and October. | April and May to September and October. | Early or mid March to September. Among the first migrants back. |
| UK status | Red list. About 59,000 pairs (2016). Down 70% between 1995 and 2024. | Green list. About 705,000 territories (2016). | Red list. About 480,000 pairs (2016). Down 40% between 1995 and 2024. | Green list. Numbers swing widely from year to year. |
Swipe the table sideways on a small screen.
The quickest way to tell them apart
Look for white. A white rump means House Martin. No white anywhere underneath means Swift. Then check the tail: long streamers and a dark throat mean Swallow. A small brown bird with a chest band over water is a Sand Martin.
Wires are a quick check too. Swallows and martins line up on them. Swifts never do, because they cannot perch.
By sight
The Swift is not related to the other three. It is built differently: wings held stiff and swept back like a boomerang, body shaped like a cigar, and no pale underparts.
Swallows show their colours best from below: dark throat, dark chest band, then a pale belly. The streamers are obvious on adults. From above they are plain blue-black with no white rump.
House Martins look black and white. The white rump flashes each time the bird turns, and the underparts are white from chin to tail. Sand Martins are the only brown ones, and the chest band stands out on the white front.
By sound
Swifts scream. On summer evenings, groups race round the rooftops at speed giving a piercing, drawn-out shriek. Nothing else in Britain sounds like it.
Swallows chatter. The song is a long, fast twitter with a dry rattle in it, usually given from a wire or a barn roof. House Martins make softer, drier chirrups around the nest. Sand Martins give a harsh, grating chatter over the colony. To check a recording, use Sound ID.
By season and habitat
All four are summer visitors that winter in Africa, but their dates differ. Sand Martins arrive first, from early March. Swallows follow from late March. House Martins come through April and into May. Swifts are last in, at the end of April or in early May, and first out: most have gone by the end of August. A Swift in October is unusual and deserves a careful look.
Swallows and House Martins stay into October. Our migration guide has more on arrival dates.
Common mistakes
- Calling a young Swallow a martin. Juveniles have short tail streamers, but still show a dark throat and chest band and no white rump.
- Calling everything overhead a Swallow. In towns, the high, dark, screaming birds are Swifts.
- Confusing young House Martins with Sand Martins. Juvenile House Martins are duller, but still have the white rump.
Where to see both
Big lakes pull in all four to feed, most of all in cool, wet spring weather when insects stay low over the water. Try Rutland Water from late April, or the meres at RSPB Leighton Moss. Sand Martins nest at RSPB Minsmere.
FAQ
What is the difference between a swift and a swallow?
A Swift is dark all over, with long, stiff, sickle-shaped wings and a short tail. A Swallow is blue-black above and pale below, with a dark red throat and long tail streamers. Swifts scream and never perch on wires. Swallows twitter and perch often.
Which arrives first in spring?
The Sand Martin, from early March. Swallows come next from late March, then House Martins in April. Swifts arrive last, in late April or early May, and are the first to leave.
Do swifts ever land?
Only at the nest. Swifts feed, drink and sleep in the air, and they cannot perch on wires or branches the way Swallows and martins do.
Log all four
Swift, Swallow, House Martin and Sand Martin are all in the Birdedex. Note the date you see each one back and compare it next year.
Open the Birdedex →