Barn Swallow

Species Profile

Barn Swallow

Hirundo rustica

Barn Swallow

Quick Facts

Conservation

LCLeast Concern

Lifespan

2 years[4]

Length

17–19 cm

Weight

16–22 g

Wingspan

32–34 cm

Migration

Long-distance Migrant

Swooping gracefully through the skies, this agile flyer catches insects on the wing and heralds the arrival of spring in many parts of the world.

Also known as: European Swallow, Common Swallow

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Juvenile Barn Swallow
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Juvenile Barn Swallow

Appearance

The Barn Swallow is a sleek, small bird with a distinctive deeply forked tail and long, pointed wings. Its upperparts are glossy steel-blue, contrasting with a rusty-red forehead and throat. The underparts are buffy to white, often with a reddish wash.

Males typically have longer tail streamers and more vibrant coloration than females. Juveniles are duller, with shorter tails and a paler throat.

Identification & Characteristics

Male Colors

Primary
Blue
Secondary
White
Beak
Black
Legs
Black

Female Colors

Primary
Blue
Secondary
White
Beak
Black
Legs
Black

Female Markings

Shorter tail streamers and paler underparts compared to males


Attributes

Agility95/100
Strength30/100
Adaptability85/100
Aggression40/100
Endurance90/100

Habitat & Distribution

Barn Swallows have a nearly global distribution, breeding across much of the Northern Hemisphere and wintering in the Southern Hemisphere. They prefer open habitats near water, including farmlands, meadows, and suburban areas.

They are common summer visitors to the UK, USA, and Canada and can be found year-round in parts of Australia. Their adaptability to human structures has allowed them to thrive in diverse environments.

Where and when to see it

How often the Barn Swallow turns up in the UK and Ireland through the year, from birdwatchers' records.

United Kingdom

Summer visitor · regularly Apr–Oct · most records in August

Ireland

Summer visitor · regularly Apr–Oct · most records in August

Regularly recordedOccasionalBar height: share of all bird records that month
Show as a table
MonthUnited KingdomIreland
January0.001%0.009%
February<0.001%0.010%
March0.052%0.054%
April1.2% (regular)1.6% (regular)
May1.8% (regular)2.8% (regular)
June1.8% (regular)2.8% (regular)
July1.9% (regular)3.0% (regular)
August2.2% (regular)3.0% (regular)
September1.6% (regular)2.2% (regular)
October0.45% (regular)0.48% (regular)
November0.033%0.021%
December0.003%0.019%

Worldwide: recorded regularly in 208 countries

Countries where it was recorded in at least 3 of the 6 years 2019–2024. Linked countries have their own bird list.

Europe (50)
Africa (49)
Asia (49)
North America (40)
South America (14)
Oceania (6)

Diet

Barn Swallows are insectivores, primarily feeding on flying insects such as flies, moths, and beetles. They catch their prey in mid-air, often flying low over fields or water bodies. They'll also eat flying ants, moths, and beetles.

During the breeding season, they may consume up to 60 insects per hour to sustain their high energy needs.

Behaviour

Barn Swallows are highly social birds, often seen in large flocks during migration and winter. They are agile flyers, catching insects on the wing with swift, graceful movements.

These birds frequently perch on wires or branches, chattering amongst themselves and preening.

Calls & Sounds

Barn Swallows are known for their cheerful, twittering song, often described as a series of liquid chirps and warbles. Their call is a sharp 'vit' or 'vit-vit'. During the breeding season, males sing more elaborately, producing a pleasant, bubbling warble that sounds like 'weet-weet-wittit-wittit-wittit'.

They also produce alarm calls when they detect a threat and when attempting to deter predators from the nest.

Nesting & Breeding

Barn Swallows typically form monogamous pairs, with breeding occurring from spring to early summer. Courtship involves aerial displays and melodious duets.

Nests are cup-shaped structures made of mud pellets mixed with grass, lined with feathers. They are often attached to rafters in barns or under bridges. Females lay 4-5 white eggs with reddish-brown spots.

Incubation lasts about 14-19 days, with both parents sharing duties. Nestlings fledge after 18-23 days but remain dependent on their parents for up to a week after leaving the nest.

Conservation

While globally listed as Least Concern, Barn Swallow populations have declined in some regions due to agricultural intensification and loss of nesting sites.

Conservation efforts focus on maintaining suitable nesting habitats and reducing pesticide use in foraging areas.

LCLeast Concern
[1]

Population

Estimated: 290,000,000 - 487,000,000 mature individuals[3]

Trend: Decreasing[2]

Elevation

Sea level to 3,000 meters

Additional Details

Predators:
Main predators include domestic cats, hawks, falcons, and occasionally snakes and rats, especially for nestlings and eggs.

Birdwatching Tips

  • Look for Barn Swallows near open fields, farmlands, and water bodies.
  • Observe their distinctive forked tails during flight.
  • Listen for their cheerful, twittering calls, especially near nesting sites.
  • In the UK and North America, check barns and outbuildings for nesting pairs in spring and summer.

Did You Know?

  1. Barn Swallows can drink and bathe on the wing, skimming the water's surface.
  2. They often return to the same nesting site year after year, travelling up to 11,000 km during migration.
  3. In many cultures, Barn Swallows symbolise good luck and heralds of spring.

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