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The Tundra Swan is a large, elegant waterfowl species, known for its pure white plumage and long, graceful neck. It is a migratory bird, breeding in the Arctic tundra and wintering in more temperate regions. There are two recognized subspecies: the Bewick's Swan (Cygnus columbianus bewickii) found in Eurasia, and the Whistling Swan (Cygnus columbianus columbianus) found in North America. This description primarily focuses on the North American Whistling Swan.
Size & lifespan
- Length
- 115-150 cm (45-59 in)
- Wingspan
- 170-195 cm (67-77 in)
- Weight
- 3.4-9.6 kg (7.5-21.2 lbs)
- Lifespan
- Up to 20 years in the wild, with records exceeding 25 years.
- Diet
- Herbivore
Physical characteristics
- Plumage
- Adult Tundra Swans have entirely pure white plumage. The feathers are dense and provide excellent insulation against cold Arctic conditions.
- Beak shape
- The bill is black, relatively short and stout compared to other swan species, with a distinctive yellow patch of varying size at the base, near the eye. The extent of the yellow patch is a key identification feature, particularly in distinguishing it from Bewick's Swan (which typically has more yellow) and Trumpeter Swan (which has an all-black bill).
- Eye color
- Dark brown
- Leg color
- Black
- Distinguishing features
- Pure white plumage, black bill with a variable yellow patch at the base (often tear-shaped or triangular), and a relatively short, straight neck compared to the Trumpeter Swan. The yellow patch on the bill is the most reliable field mark for the North American subspecies.
- Juvenile appearance
- Juvenile Tundra Swans (cygnets) have dull, grayish-white plumage, particularly on the head and neck, which gradually whitens over their first year. Their bills are pinkish-black with a black tip, and the yellow patch is absent or very faint. Their legs are also pinkish-gray, darkening to black with age.
- Seasonal changes
- No significant seasonal plumage changes. The plumage remains white year-round. However, during migration and wintering, their white feathers can become stained with rust or brown from iron-rich water or mud, particularly on the head and neck.
- Sexual dimorphism
- Males (cobs) and females (pens) are outwardly similar in plumage. Males are generally slightly larger and heavier than females, but this difference is often not discernible in the field.
How to identify
- 1
Size and Shape
Look for a large, all-white swan with a relatively short, straight neck. It's smaller than a Trumpeter Swan but larger than most geese.
- 2
Bill Color and Pattern
Observe the bill carefully. It will be black with a variable yellow patch at the base, near the eye. The size and shape of this yellow patch are crucial for identification and distinguishing it from other swan species. No yellow indicates a Trumpeter Swan; an orange bill with a black knob indicates a Mute Swan.
- 3
Vocalizations
Listen for their distinctive high-pitched, musical 'whoo-ho-ho' calls, often compared to a clarinet. This is a key differentiator from the deeper, bugling calls of Trumpeter Swans.
- 4
Flight
Note their powerful, direct flight with slow wingbeats, often in V-formations. The whistling sound produced by their wings in flight is also a good clue.
- 5
Juvenile Plumage
Young birds will have grayish-white plumage and pinkish-black bills, gradually whitening and darkening over their first year. The yellow bill patch will be absent or very faint on juveniles.
Habitat & range
- Biomes
- Arctic tundra, freshwater wetlands, coastal estuaries, agricultural fields, large lakes, and slow-moving rivers.
- Geographic range
- Breeds in the Arctic tundra of North America (Alaska, Canada) and Eurasia (Siberia). Winters in temperate regions of North America (Pacific and Atlantic coasts, Great Plains, southern states) and Eurasia (Western Europe, Caspian Sea, East Asia).
- Elevation range
- Primarily found at low elevations, from sea level up to a few hundred meters, especially in their breeding grounds and wintering areas.
- Preferred environments
- During breeding, they prefer shallow tundra ponds, lakes, and slow-moving rivers with abundant aquatic vegetation. In winter, they utilize large freshwater lakes, estuaries, coastal bays, flooded agricultural fields (especially corn and rice), and marshes.
Behavior
- Activity time
- Diurnal, actively feeding and moving during daylight hours. They may also feed at night, especially during full moons or in areas with artificial light.
- Feeding habits
- Primarily herbivorous, feeding on aquatic vegetation such as pondweeds, sedges, rushes, and tubers, which they obtain by dabbling or upending in shallow water. They also graze on grasses and waste grains (corn, rice) in agricultural fields during migration and winter. Invertebrates are occasionally consumed, especially by cygnets.
- Social behavior
- Highly social, especially during migration and winter, forming large flocks that can number in the thousands. During the breeding season, they are territorial and typically found in monogamous pairs, though some loose colonies may form in areas with abundant resources.
- Flight pattern
- Powerful and direct flight, with slow, deliberate wingbeats. They fly in V-formations or long, undulating lines during migration. Their flight produces a distinctive whistling sound from their wings, which contributes to their North American subspecies' common name, 'Whistling Swan'.
- Migration pattern
- Long-distance migratory birds. They breed in the Arctic during the short summer and migrate south to temperate wintering grounds. North American populations follow distinct flyways: one along the Pacific coast and another along the Atlantic coast and through the central United States. Migration occurs from September to November in autumn and March to May in spring.
- Territoriality
- Highly territorial during the breeding season, with pairs defending their nesting sites and surrounding feeding areas from other swans and sometimes other waterfowl. In wintering grounds, they are much less territorial, forming large, cohesive flocks.
Song & calls
- Song
- Tundra Swans do not have a complex song. Their vocalizations are generally described as calls.
- Call
- Their calls are high-pitched, musical, and often described as a 'whoo-ho-ho' or 'woo-woo-woo' sound, resembling the sound of a clarinet or oboe. They are less resonant and lower-pitched than the bugling calls of Trumpeter Swans. They also produce a variety of hisses and grunts, especially when agitated or communicating within a flock.
- When they vocalize
- Vocalize frequently, especially during flight, when communicating within flocks, and when disturbed. Calls are particularly noticeable during migration and on wintering grounds.
Breeding & reproduction
- Breeding season
- Late May to early June, immediately after the snowmelt in the Arctic tundra.
- Nesting habits
- Nests are large mounds built on elevated ground near water, such as on small islands, hummocks, or raised banks. They are constructed from moss, sedges, grasses, and other available tundra vegetation, lined with down feathers. Both parents participate in nest building.
- Clutch size
- 3-5 eggs, occasionally 2-7.
- Egg description
- Eggs are typically dull white or creamy, sometimes stained brown. They are large and oval-shaped.
- Incubation period
- 31-32 days, primarily by the female, while the male guards the nest.
- Fledging period
- 60-75 days. Cygnets are precocial and can swim and feed shortly after hatching, but remain with their parents for their first year, often migrating with them.
- Parental care
- Both parents care for the young. The male defends the territory and family, while the female primarily incubates and broods. Both lead the cygnets to feeding areas and protect them from predators. Family groups remain together through their first winter.
Where to find
Arctic Tundra
During the breeding season (summer), they can be found in the remote wetlands, ponds, and shallow lakes of the North American and Eurasian Arctic.
Coastal Estuaries and Bays
In winter, large concentrations can be found along the Pacific and Atlantic coasts of North America, particularly in estuaries, shallow bays, and coastal marshes.
Agricultural Fields
During migration and winter, they frequently utilize flooded agricultural fields, especially those planted with corn or rice, to forage for waste grains.
Large Freshwater Lakes and Rivers
Wintering populations also gather on large, open freshwater lakes and slow-moving rivers, particularly in the Great Plains and southern United States.
Field tips
- Look for large white birds in open water or fields.. Tundra Swans are conspicuous due to their size and bright white plumage. Scan large bodies of water or open fields, especially during migration and winter.
- Listen for their distinctive calls.. Their musical 'whoo-ho-ho' calls are often heard before the birds are seen, especially when large flocks are present or flying overhead.
- Pay attention to bill details.. Binoculars or a spotting scope are essential to clearly see the yellow patch on the black bill, which is the most reliable identification mark.
- Visit known wintering grounds or migration stopovers.. Consult local birding resources or eBird for information on specific locations where Tundra Swans congregate during their non-breeding seasons.
- Observe family groups.. During winter, you may see family groups with grayish-plumaged juveniles accompanying their white parents, providing a good opportunity to study age differences.
Similar species
Trumpeter Swan
Cygnus buccinator
The Trumpeter Swan is generally larger than the Tundra Swan, with a longer, straighter neck. The most reliable field mark is the bill: Trumpeter Swans have an entirely black bill with no yellow patch. Their call is a deeper, more resonant, bugle-like sound, distinct from the Tundra Swan's higher-pitched 'whoo-ho-ho'.
Mute Swan
Cygnus olor
Mute Swans are distinguished by their orange bill with a prominent black knob at the base, and their characteristic S-shaped neck posture, often holding their neck in a graceful curve with the bill pointed downwards. They are typically silent, hence the name 'Mute Swan', though they can hiss. They are often found in more urban or semi-domesticated settings.
Bewick's Swan
Cygnus columbianus bewickii
Bewick's Swan is the Eurasian subspecies of Tundra Swan. It is slightly smaller than the North American Whistling Swan and typically has a larger, more extensive yellow patch on its bill, often extending further towards the tip and covering more of the bill's side. The exact pattern of yellow and black on the bill is used to distinguish individuals and subspecies.
Quick facts
- Status:
- Least Concern
- Diet:
- Herbivore (aquatic vegetation, waste grains)
- Habitat:
- Arctic tundra (breeding), wetlands, estuaries, agricultural fields (wintering)
- Migration:
- Long-distance migrant
- Sociality:
- Highly social in winter, territorial in breeding season
Fun facts
- The North American subspecies is often called the 'Whistling Swan' due to the whistling sound produced by its wings in flight.
- Tundra Swans undertake one of the longest migratory journeys of any waterfowl, traveling thousands of miles between their Arctic breeding grounds and temperate wintering areas.
- Family bonds are strong; cygnets often stay with their parents for their entire first year, including during migration.
- The size and shape of the yellow patch on the bill of a Tundra Swan can be as unique as a human fingerprint, allowing researchers to identify individual birds.
- They are excellent divers, capable of reaching aquatic vegetation in water several feet deep by upending their bodies.
Scientific classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Anseriformes
- Family
- Anatidae
- Genus
- Cygnus
- Species
- Cygnus columbianus
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