Common House Martin

Informazioni

The Common House Martin, known in Italian as Balestruccio, is a small passerine bird in the swallow family. It is a highly aerial insectivore, recognized by its distinctive glossy blue-black upperparts, pure white underparts, and a prominent white rump. It is a migratory species, breeding across the Palearctic and wintering in sub-Saharan Africa and tropical Asia.

Dimensioni e longevità

Lunghezza

13-15 cm

Apertura alare

26-29 cm

Peso

15-22 g

Longevità

Average 2-5 years, up to 10 years recorded

Dieta

Insectivore

Caratteristiche fisiche

Piumaggio

Adults have glossy blue-black upperparts, including the head, back, and wings. The underparts are pure white, extending to a very conspicuous white rump. The tail is forked but less deeply than that of the Barn Swallow, and lacks streamers. The legs are covered in small white feathers.

Forma del becco

Small, flattened, and broad at the base, adapted for catching insects in flight. Black in color.

Colore degli occhi

Dark brown.

Colore delle zampe

Pinkish-black, covered in small white feathers (tarsi and toes).

Caratteristiche distintive

Key features include the pure white rump, entirely white underparts, and feathered legs. Its flight is often described as more fluttering and less graceful than the Barn Swallow.

Aspetto giovanile

Juveniles are duller than adults, with sooty-brown upperparts instead of glossy blue-black. The white underparts may be tinged brownish, and the white rump is less bright. The feathers on the legs are less developed.

Cambiamenti stagionali

No significant seasonal plumage changes. The glossy blue-black upperparts may appear duller due to feather wear towards the end of the breeding season.

Dimorfismo sessuale

Males and females are virtually identical in plumage and size.

Come identificare

1. 1

   Rump Color

   Look for the striking, pure white rump, which contrasts sharply with the dark back. This is the most reliable field mark.

2. 2

   Underparts Color

   Observe the entirely pure white underparts, from chin to undertail coverts, without any streaking or rufous coloration.

3. 3

   Upperparts Gloss

   Note the glossy blue-black upperparts, which can appear iridescent in good light.

4. 4

   Tail Shape

   Check the tail, which is forked but relatively short and lacks the long streamers of the Barn Swallow.

5. 5

   Legs

   If close enough, observe the small white feathers covering the legs, a unique feature among European swallows.

6. 6

   Flight Style

   Its flight is often described as more 'fluttering' and less sweeping than the Barn Swallow, often flying higher and in tighter circles.

7. 7

   Nesting Sites

   Look for mud nests attached to the outside walls of buildings, under eaves, or on bridges, often in colonies.

Habitat e areale

Biomi

Temperate grasslands, open woodlands, agricultural areas, urban and suburban environments.

Areale geografico

Breeds across most of Europe, temperate Asia, and North Africa. Winters in sub-Saharan Africa and tropical Asia.

Fascia altitudinale

From sea level up to 2,000 meters, occasionally higher in mountainous regions.

Ambienti preferiti

Prefers open country with access to water and suitable nesting sites, typically man-made structures like buildings, bridges, and cliffs. Often found in villages, towns, and cities.

Comportamento

Periodo di attività

Diurnal.

Abitudini alimentari

Feeds exclusively on flying insects, primarily small flies (Diptera), aphids (Aphididae), and small beetles (Coleoptera). It forages high in the air, often over water or open fields, catching prey on the wing with its wide gape.

Comportamento sociale

Highly social, especially during breeding and migration. Breeds in colonies, sometimes numbering hundreds of pairs. Roosts communally in large numbers, often in reedbeds or on buildings, outside the breeding season.

Tipo di volo

Characterized by rapid, agile, and often erratic flight, with frequent glides. It flies higher than the Barn Swallow and often in tighter circles. Its flight appears more 'fluttering' due to its shorter, broader wings.

Migrazione

A long-distance migratory species. European populations migrate south to sub-Saharan Africa, while Asian populations winter in tropical Asia. Migration occurs in broad fronts, often in large flocks, typically from late August to October and returning from March to May.

Territorialità

Colonial breeder, defending only the immediate vicinity of the nest. Foraging areas are shared.

Riproduzione

Stagione riproduttiva

Typically May to August in Europe, with two or sometimes three broods.

Abitudini di nidificazione

Builds a distinctive enclosed, cup-shaped nest of mud pellets, lined with grass and feathers. Nests are typically attached to vertical surfaces under eaves, ledges, bridges, or cliffs, often in colonies. Both sexes participate in nest building.

Dimensione della covata

3-7 eggs, most commonly 4-5.

Descrizione dell'uovo

Usually 4-5 (range 3-7) pure white, unmarked, slightly glossy eggs.

Periodo di incubazione

13-16 days, primarily by the female, but both parents may share duties.

Periodo di involo

22-32 days after hatching. Young are fed by both parents.

Cure parentali

Both parents feed and care for the young. After fledging, young birds are still fed by parents for a short period and often return to the nest to roost.

Dove trovarlo

Consigli sul campo

1. Look Up. House Martins typically forage higher in the air than Barn Swallows. Scan the skies above buildings and open fields.
2. Check Buildings. During the breeding season, look for their distinctive mud nests under the eaves of houses, barns, and other structures. The birds will be flying in and out.
3. Observe Flight. Their flight is often more erratic and 'fluttery' compared to the more graceful, sweeping flight of the Barn Swallow. Look for rapid turns and glides.
4. Listen for Calls. Their 'chip' or 'chrip' calls are distinctive and often given in flight, helping to locate them.
5. Migration Hotspots. During spring and autumn migration, large flocks can be observed at coastal watchpoints or over large bodies of water.

Specie simili

Fatti rapidi

Distinguishing Mark:

Pure white rump

Nesting Material:

Mud pellets

Diet:

Exclusively flying insects

Sociality:

Highly colonial breeder

Migration:

Long-distance migrant to Africa/Asia

Curiosità

• House Martins often reuse their mud nests year after year, repairing them as needed. They may also take over old Barn Swallow nests.
• The white feathers on their legs are thought to help keep the nest clean by preventing mud from sticking to their feet during nest construction.
• They are highly dependent on human structures for nesting, making them a common sight in populated areas across their range.
• A single House Martin can consume thousands of insects per day, playing a significant role in pest control.
• Despite their small size, they undertake epic migrations, covering thousands of kilometers between their breeding and wintering grounds.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Passeriformes

Famiglia

Hirundinidae

Genere

Delichon

Specie

Delichon urbicum

Esplora Common House Martin