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The Bewick's Swan is a small Holarctic swan, a subspecies of the Tundra Swan (Cygnus columbianus). It is known for its distinctive yellow and black bill pattern, which is unique to each individual, much like a human fingerprint. These elegant birds are migratory, breeding in the Arctic tundra of Eurasia and wintering in temperate regions of Europe and Asia. They are primarily herbivorous, feeding on aquatic vegetation and agricultural crops.
Size & lifespan
- Length
- 115-127 cm (45-50 in)
- Wingspan
- 170-195 cm (67-77 in)
- Weight
- 3.4-7.8 kg (7.5-17.2 lbs)
- Lifespan
- Up to 10-15 years in the wild, with records of over 20 years.
- Diet
- Herbivore (primarily aquatic plants, grasses, sedges, tubers, roots, and agricultural crops like potatoes and grains)
Physical characteristics
- Plumage
- Adults are entirely white. Juveniles have greyish-brown plumage, particularly on the head and neck, which gradually whitens over their first year.
- Beak shape
- Relatively short and wedge-shaped. The bill pattern is a key identification feature: a combination of black and yellow. The yellow patch is typically smaller and more rounded than that of the Whooper Swan, often not extending below the nostril.
- Eye color
- Dark brown
- Leg color
- Black
- Distinguishing features
- The most crucial distinguishing feature is the bill pattern. Bewick's Swans have a smaller, more rounded yellow patch on the bill compared to the Whooper Swan, which has a larger, more pointed yellow patch extending to a point below the nostril. The yellow on Bewick's bill is typically restricted to the base, with a larger black tip. Their neck is also shorter and thicker than the Whooper Swan's.
- Juvenile appearance
- 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 their bill develops the adult black and yellow pattern over their first year.
- Seasonal changes
- No significant seasonal plumage changes in adults, always white. Juveniles transition from grey-brown to white during their first year.
- Sexual dimorphism
- Males (cobs) are generally slightly larger than females (pens), but plumage is identical.
How to identify
- 1
Bill Pattern
Look closely at the bill. Bewick's Swans have a distinctive black and yellow pattern. The yellow area is typically smaller and more rounded, often not extending below the nostril, with a larger black tip. This is the most reliable field mark to distinguish it from the Whooper Swan.
- 2
Size and Neck
Bewick's Swans are smaller and have a shorter, thicker neck compared to the Whooper Swan. They are larger than most geese but smaller than Mute Swans.
- 3
Vocalizations
Listen for their characteristic 'honking' or 'barking' calls, which are higher-pitched than the Mute Swan's hisses and less bugling than the Whooper Swan's trumpeting calls.
- 4
Plumage
Adults are pure white. Juveniles are greyish-brown, gradually whitening over their first year. Note the bill color of juveniles (pinkish-grey with a black tip).
- 5
Behavior
Observe their feeding behavior (dabbling in shallow water, grazing on fields) and social interactions within flocks.
Habitat & range
- Biomes
- Arctic tundra, freshwater wetlands, estuaries, coastal lagoons, agricultural fields.
- Geographic range
- Breeds in the Arctic tundra of northern Russia (Siberia). Winters primarily in temperate regions of Europe (e.g., UK, Netherlands, Germany) and East Asia (e.g., Japan, Korea, China).
- Elevation range
- Typically found at low elevations, from sea level up to a few hundred meters.
- Preferred environments
- Shallow freshwater lakes, ponds, slow-moving rivers, marshes, and estuaries during migration and winter. Breeding grounds are typically wet tundra with numerous small lakes and pools. In winter, they often utilize flooded grasslands and agricultural fields for feeding.
Behavior
- Activity time
- Diurnal, primarily active during daylight hours for feeding and social interactions.
- Feeding habits
- Primarily grazers and dabblers. They feed on submerged aquatic vegetation, roots, tubers, and seeds by dabbling in shallow water. On land, they graze on grasses, sedges, and agricultural crops such as potatoes, sugar beet tops, and winter cereals. They often feed in flocks.
- Social behavior
- Highly social, especially outside the breeding season. They form large flocks during migration and in wintering grounds. They are monogamous and form strong pair bonds, often mating for life. Family groups remain together throughout the winter.
- Flight pattern
- Strong, direct flight with slow, powerful wing beats. They fly in V-formations or in long, undulating lines during migration. Their flight can be noisy due to the wing beats.
- Migration pattern
- Long-distance migratory. They breed in the Arctic tundra of Siberia and migrate south to wintering grounds in Western Europe (e.g., UK, Netherlands) and East Asia (e.g., Japan, Korea, China). Migration typically occurs from September to November and March to May.
- Territoriality
- Territorial during the breeding season, defending their nesting sites. Less territorial in wintering grounds, where they gather in large, often mixed-species, flocks.
Song & calls
- Song
- Bewick's Swans do not have a complex song. Their vocalizations are primarily calls.
- Call
- Their calls are distinctive, often described as a 'honking' or 'barking' sound, higher-pitched and more musical than the Mute Swan, but less bugling than the Whooper Swan. They produce a variety of calls, including a 'hoo-hoo-hoo' or 'kow-kow-kow' sound, often given in flight or when disturbed. Family groups communicate with softer, conversational calls.
- When they vocalize
- Vocalize frequently, especially in flight, when communicating within flocks, or when disturbed. More vocal than Mute Swans.
Breeding & reproduction
- Breeding season
- Late May to August, with egg-laying typically in June.
- Nesting habits
- Nests are large mounds of vegetation (moss, sedges, grasses) lined with down, built on small islands or elevated ground near water in the tundra. Both parents participate in nest building.
- Clutch size
- 3-5 eggs (range 2-7)
- Egg description
- Typically 3-5 eggs, dull white or creamy, becoming stained during incubation. They are large, oval-shaped.
- Incubation period
- 29-30 days, primarily by the female.
- Fledging period
- 40-45 days. Cygnets are able to fly at about 60-70 days old.
- Parental care
- Both parents care for the young (cygnets). Cygnets remain with their parents for their first winter migration and often into their second year.
Where to find
Wintering Grounds (Europe)
Look for them in coastal estuaries, large freshwater lakes, flooded grasslands, and agricultural fields in the UK (e.g., Slimbridge WWT), Netherlands, Germany, and other parts of Western Europe from late autumn to early spring.
Wintering Grounds (East Asia)
In East Asia, they can be found in similar wetland habitats and agricultural areas in Japan, Korea, and parts of China during the winter months.
Breeding Grounds
During the summer, they are found in the remote Arctic tundra of Siberia, which is generally inaccessible to most birdwatchers.
Field tips
- Use a scope or binoculars. Due to their often distant feeding habits and the subtle differences in bill patterns, good optics are essential for accurate identification.
- Study bill patterns. Familiarize yourself with the typical yellow and black bill patterns of Bewick's and Whooper Swans before going into the field. Each Bewick's Swan has a unique bill pattern, which can be used for individual identification by researchers.
- Listen for calls. Their vocalizations are a key identifier, especially when birds are in flight or at a distance.
- Visit known wintering sites. Conservation reserves and wetlands known to host wintering Bewick's Swans (e.g., WWT Slimbridge in the UK) offer excellent opportunities for observation.
- Observe family groups. Look for adults accompanied by greyish-brown juveniles, which indicates a successful breeding season and provides insight into their social structure.
Similar species
Whooper Swan
Cygnus cygnus
The most common confusion species. Bewick's Swan has a smaller, more rounded yellow patch on the bill, which typically does not extend below the nostril, and a larger black tip. The Whooper Swan has a larger, more pointed yellow patch that extends to a point below the nostril, and a smaller black tip. Whooper Swans are also generally larger with a longer, more elegant neck. Their calls are more bugling and trumpet-like.
Mute Swan
Cygnus olor
Mute Swans are easily distinguished by their orange bill with a prominent black knob at the base (larger in males). They typically hold their neck in an 'S' curve and often hold their wings arched over their back. Mute Swans are largely silent, hence their name, only hissing when disturbed, unlike the vocal Bewick's Swan.
Tundra Swan (Whistling Swan)
Cygnus columbianus columbianus
The American subspecies of the Tundra Swan. While genetically very close, the Whistling Swan typically has a much smaller yellow patch on the bill, often just a small yellow spot or entirely black. Its range is North America, while Bewick's is Eurasian.
Quick facts
- Subspecies of:
- Tundra Swan (Cygnus columbianus)
- Key ID Feature:
- Small, rounded yellow patch on bill, not extending below nostril
- Migration:
- Long-distance migrant (Siberia to Europe/East Asia)
- Diet:
- Aquatic vegetation, roots, agricultural crops
- Sociality:
- Highly social in winter, forms large flocks
Fun facts
- Each Bewick's Swan has a unique bill pattern, much like a human fingerprint. Researchers use these patterns to identify individual birds and track their movements and life histories.
- The Bewick's Swan was named after Thomas Bewick, an English engraver and ornithologist, who illustrated the bird in his 'History of British Birds' in 1804.
- These swans undertake epic migrations, flying thousands of kilometers from their Arctic breeding grounds to their wintering sites, often navigating using celestial cues and the Earth's magnetic field.
- Family groups, including the cygnets, often migrate together and stay as a cohesive unit throughout the winter, demonstrating strong family bonds.
- The European population of Bewick's Swans has experienced significant declines in recent decades, making conservation efforts crucial for their survival.
Scientific classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Anseriformes
- Family
- Anatidae
- Genus
- Cygnus
- Species
- Cygnus columbianus
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