Whooper Swan

Informazioni

The Whooper Swan is a large, elegant waterfowl species, renowned for its striking yellow and black bill and loud, bugling calls. It is a migratory bird, breeding in the Arctic and subarctic regions of Eurasia and wintering further south. It is one of the heaviest flying birds and a prominent symbol of wild wetlands.

Dimensioni e longevità

Lunghezza

140-165 cm (55-65 in)

Apertura alare

205-275 cm (81-108 in)

Peso

7.4-14 kg (16-31 lb), males typically larger than females

Longevità

Up to 10-15 years in the wild, with records of over 20 years

Dieta

Herbivore

Caratteristiche fisiche

Piumaggio

Adults are entirely pure white. Juveniles have greyish-brown plumage, particularly on the head and neck, which gradually whitens over their first year.

Forma del becco

Large, wedge-shaped bill. Adults have a distinctive pattern of yellow and black: the basal half is bright yellow, extending to a point on the culmen, while the distal half and tip are black. Juveniles have a pinkish-grey bill with a black tip, gradually developing the adult coloration.

Colore degli occhi

Dark brown

Colore delle zampe

Black

Caratteristiche distintive

The most distinctive feature is the large yellow and black bill pattern. Unlike the Mute Swan, it holds its neck straight and lacks a knob at the base of the bill. Its calls are also very distinctive.

Aspetto giovanile

Juveniles are greyish-brown, especially on the head and neck, with a pinkish-grey bill that has a black tip. Their plumage gradually whitens, and the bill develops adult coloration over their first year.

Cambiamenti stagionali

No significant seasonal plumage changes in adults; they remain white year-round. Juveniles transition from grey-brown to white over their first year.

Dimorfismo sessuale

Males (cobs) are generally larger and heavier than females (pens), but plumage is identical.

Come identificare

1. 1

   Bill Pattern

   Look for the distinctive large yellow patch on the basal half of the bill, which extends to a point on the culmen, contrasting sharply with the black tip. This is the most reliable field mark for adults.

2. 2

   Neck Posture

   Observe how the swan holds its neck. Whooper Swans typically hold their neck straight and erect, unlike the S-curve of the Mute Swan.

3. 3

   Vocalizations

   Listen for the loud, bugling, trumpet-like 'whoop-whoop' calls, especially in flight or when disturbed. This is a key differentiator from the silent Mute Swan.

4. 4

   Size

   Note its large size, though it can be confused with other large swans. Use bill pattern and calls for definitive identification.

5. 5

   Juvenile Plumage

   Young Whooper Swans are greyish-brown with a pinkish-grey bill and black tip, gradually whitening and developing the adult bill pattern over their first year.

Habitat e areale

Biomi

Tundra, taiga, temperate wetlands, freshwater lakes, rivers, marshes, coastal lagoons, estuaries, agricultural fields (during winter).

Areale geografico

Breeds across the Arctic and subarctic regions of Eurasia, from Iceland and Scandinavia eastward through Russia to the Pacific. Winters in temperate Europe, the Black Sea and Caspian Sea regions, Central Asia, China, Korea, and Japan.

Fascia altitudinale

Primarily lowlands, from sea level up to a few hundred meters, especially in breeding and wintering grounds.

Ambienti preferiti

Shallow, nutrient-rich freshwater bodies with abundant aquatic vegetation for feeding. During winter, they also utilize coastal areas and flooded agricultural land.

Comportamento

Periodo di attività

Diurnal, active during daylight hours for feeding and other activities.

Abitudini alimentari

Primarily herbivorous, feeding on aquatic vegetation such as submerged plants, roots, tubers, and seeds. They dabble and up-end in shallow water to reach food. In winter, they may graze on agricultural crops like winter wheat and potatoes.

Comportamento sociale

Highly social, especially outside the breeding season, forming large flocks on wintering grounds. During breeding, they are territorial and typically found in isolated pairs or small family groups.

Tipo di volo

Powerful, direct flight with slow, deliberate wingbeats. They fly with their necks outstretched. Often fly in V-formations or in long, undulating lines during migration. Their wings produce a characteristic 'whooping' sound in flight.

Migrazione

Long-distance migratory bird. Breeds in the Arctic and subarctic during summer and migrates south to temperate regions for winter. Migration occurs in large flocks, often at high altitudes.

Territorialità

Strongly territorial during the breeding season, defending their nesting sites and surrounding feeding areas from other swans and waterfowl. Less territorial on wintering grounds, where they gather in large, often mixed-species, flocks.

Riproduzione

Stagione riproduttiva

May to July, depending on latitude and ice melt.

Abitudini di nidificazione

Nests are large mounds of vegetation (grasses, moss, sedges, reeds) built on small islands, hummocks, or dense vegetation near water. Both parents contribute to nest building.

Dimensione della covata

Usually 4-7 eggs, but can range from 3 to 9.

Descrizione dell'uovo

Typically 4-7 eggs, dull white or creamy, sometimes stained brown. Large, oval-shaped.

Periodo di incubazione

35-42 days, primarily by the female, while the male guards the nest.

Periodo di involo

60-70 days. Cygnets are precocial and can swim and feed shortly after hatching, but remain with parents for several months, often through their first winter.

Cure parentali

Both parents care for the young (cygnets). They are highly protective and will aggressively defend their offspring. Cygnets stay with their parents for their first winter migration.

Dove trovarlo

Consigli sul campo

1. Listen for Calls. Their loud, bugling calls are often heard before the birds are seen, especially during migration or when large flocks are present.
2. Scan Water Bodies. Use binoculars or a scope to scan large expanses of water for their distinctive white plumage and bill pattern.
3. Observe Feeding Behavior. Watch for them dabbling or up-ending in shallow water, indicating feeding activity.
4. Check Wintering Grounds. Visit known wintering sites, such as nature reserves and protected wetlands, where large numbers often congregate.
5. Look for Family Groups. During late summer and autumn, look for family groups with greyish-brown cygnets accompanying the white adults.

Specie simili

Fatti rapidi

Wingspan:

Up to 2.75 meters (9 feet)

Weight:

One of the heaviest flying birds, up to 14 kg (31 lbs)

Bill Color:

Distinctive yellow and black pattern

Vocalization:

Loud, bugling 'whoop' calls

Migration:

Long-distance migrant, often in V-formations

Curiosità

• The Whooper Swan is the national bird of Finland.
• Its scientific name, 'Cygnus cygnus', is a tautonym, meaning the genus and species names are the same, reflecting its iconic status as 'the swan'.
• Whooper Swans form strong pair bonds that often last for life.
• They are known to fly at considerable altitudes during migration, sometimes reaching several thousand meters.
• The 'whooping' sound of their wings in flight is a characteristic feature, giving them their common name.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Anseriformes

Famiglia

Anatidae

Genere

Cygnus

Specie

Cygnus cygnus

Esplora Whooper Swan