| Kingdoms / Animalia / Craniata / Aves / Anseriformes / Anatidae / Cygnus / Species |
| < > Cygnus columbianus - Tundra swan (Click photographs/illustrations: full picture & further details) |
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Alternative Names (Synonyms) |
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| Zwergschwan (German) Cygne de Bewick (French) Cisne de Bewick (Spanish) Bewick's Swan - Cygnus columbianus bewickii / Cygnus bewickii Jankowski's Swan - Cygnus columbianus jankowskii (race/subspecies) Whistling Swan - Cygnus columbianus columbianus / Cygnus columbianus Pfeifschwan (German) Cygne siffleur (French) Cisne silbador (Spanish) Cisne chico (Spanish) Klein Zwann (Dutch) Mindre sangsvan (Swedish) Olor bewickii Olor columbianus |
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Names for newly-hatched |
Cygnet, downy. |
Names for non-breeding males or other colour-phases |
Male swan often called "Cob". |
Species Author |
Debra Bourne |
Major References |
B1, B2, B3, B4, B8, B9, B19, B25, B26, B27 Aviculture references: |
ORGANISATIONS |
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TAXA Group (where information has been collated for an entire group on a modular basis) |
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Parent Group |
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Specific Needs Group referenced in Management Techniques |
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Aviculture Information |
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Notes |
General information:
(B7, B10.26.w2, B29, B30, B40, B94, B95, B97, B108, B128.w4, D1). Species-specific information:
(J23.13.w7, B29, B30, B40, B96, B97, B129, D1) Aviornis UK Ringing Scheme recommended average closed ring size: V 24.0mm (D8). |
| Individual Techniques linked in Wildpro |
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External Appearance (Morphology)
Measurement & Weight |
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| Length | 48-58 inches
120-150cm Whistling swan Cygnus columbianus columbianus; 45-55 inches 115-140cm Bewick's swan Cygnus columbianus bewickii (B1,B3) |
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| Adult weight | General | Cygnus columbianus
columbianus 4.3-9.6kg Cygnus columbianus bewickii 3.4-7.8kg (B1) |
| Male | Cygnus columbianus
columbianus 4.7-9.6 average 7.1kg (B3); mean
15.7 lbs. (B8) Cygnus columbianus bewickii 4.9-7.8kg average 6.4kg (B3); mean 14.1 lbs. (B8) |
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| Female | Cygnus columbianus
columbianus 4.3-8.2kg, average 6.2kg (B3); mean
13.7 lbs. (B8) Cygnus columbianus bewickii 3.4-6.4kg average 5.0kg (B3); mean 12.5 lbs. (B8) |
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| Newly-hatched weight | Cygnus
columbianus columbianus 180g (B9) Cygnus columbianus bewickii 178g (B9) |
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| Growth rate | Cygnus columbianus columbianus 28.9 times hatching weight at 70 days (B9) | |
| Adult | Bill | Male | Whistling swan Cygnus
columbianus columbianus: Black, with variable yellow spot in front of eye. Bill length
less than 50mm from front of nostrils to tip of bill. Bewick's swan Cygnus columbianus bewickii: Black with yellow above/behind nostrils. |
| Variations (If present) | -- | ||
| Eyes (Iris) | Male | Brown. | |
| Variations(If present) | -- | ||
| Juvenile | Bill | Pinkish, with base turning white then yellow and black spreading from the tip. | |
| Eyes (Iris) | Brown. | ||
| Adult | Male | Black. |
| Variations (If present) | -- | |
| Juvenile | Dark grey. | |
| Adult | Male![]() |
White. Head more rounded than Cygnus cygnus - Whooper swan. |
Variations (If present)![]() |
-- | |
| Juvenile | Some grey feathers. | |
Newly-hatched Characteristics |
| General: Upperparts
pale silver-grey with vague darker patterning, underparts white. Bill: Flesh-pink, with grey along the sides and at the tip. Feet: Pale orange. |
Nest placement and structure |
| On elevated ground, a large mound of vegetation. |
Egg clutches |
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| No. of Eggs | Average | 3-5 (B1); Cygnus columbianus columbianus 4-5 (B8). |
| Range | 2-6 (B1) ; Cygnus columbianus columbianus 2-7 (B8), Cygnus columbianus bewickii 4-6 (B8) | |
| Egg Description | White or creamy (B3, B8). Cygnus columbianus columbianus Size: 110 x 73mm, weight: 280g. Cygnus columbianus bewickii Size: 103 x 67mm, weight: 260g (B3). | |
| Cygnus columbianus columbianus 30-32 days, Cygnus columbianus bewickii 29-30 days (B1, B3). |
| Synchronous. |
| Cygnus columbianus columbianus 60-75days (B1), 60-70 days (B8); Cygnus columbianus bewickii 50-70days (40-45days reported) (B1, B8). |
Sexual Maturity |
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| Males | Pair formation at 3 to 4 years, but often only breed at 5-6 years. |
| Females | Pair formation at 3 to 4 years, but often only breed at 5-6 years. |
Feeding Behaviour |
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| Adults | Head-dipping, upending, grazing, both day and night. |
| Newly-hatched | Initially pecking and dabbling at surface, making use of food brought to surface by adults, later as adults. |
Parental Behaviour |
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| Nest-building | By both parents. |
| Incubation | By female, although male sometimes sits while she feeds. |
| Newly-hatched | Both parents tend the cygnets. |
| Juveniles | Stay with parents through the first winter and sometimes rejoin in their second and third winters. |
Social Behaviour |
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| Intra-specific | Gregarious in winter, territorial while breeding |
| Inter-specific | -- |
Sexual Behaviour |
| Strong permanent pair bonds. |
Predation in Wild |
| Cygnets may be taken by coyotes, Arctic foxes, golden eagles. |
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| Circadian | Feed in the day and at night. |
| Aquatic plants (leaves, stems, roots, rhizomes), and grasses, also grain and potatoes in winter. |
| Insects important initially, later as adults. |
Distribution and Movement (Migration etc.) |
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| Normal | Cygnus columbianus
columbianus Tundra of arctic North America, wintering in western and coastal eastern
USA Cygnus columbianus bewickii from Kola Peninsula east throughout arctic north Siberia. Winters in western Europe, south of Caspian Sea and in eastern China, Korea, and Japan. Accidental Spitsbergen, Bear Island, Poland Czechoslovakia, Hungary, Austria, Switzerland, Yugoslavia, Greece, Israel, Iraq, Spain, Italy, Libya, Algeria. Rare vagrant Pakistan. (North east Asian population sometimes distinguished as Cygnus columbianus jankowskii) Migratory, moving to lower latitudes for the winter. |
| Occasional and Accidental | -- |
| Introduced | -- |
| Arctic tundra: shallow pools, lakes swampy bogs and sluggish stream and rivers. Winter habitats often coastal: marshes, grasslands, and agricultural fields. |
Intraspecific variation |
| Bewick's Swan - Cygnus columbianus
bewickii / Cygnus bewickii Jankowski's Swan - Cygnus columbianus jankowskii (race/subspecies) Whistling Swan - Cygnus columbianus columbianus / Cygnus columbianus |
Conservation Status |
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| Wild Population - (Importance) |
Stable and not globally threatened (B1). |
| General Legislation |
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| CITES listing | Cygnus columbianus jankowskii (race of Cygnus columbianus bewickii) listed CITES II (B1). |
| Red-data book listing | Listing not yet included. |
| Threats | Lead poisoning and hunting, also oil pollution, collisions e.g. with power lines, loss of habitat (B1, B8). |
Captive Populations |
| Reasonable numbers of Cygnus columbianus columbianus in American collections and breeding is increasing. Few Cygnus columbianus bewickii in collections and rarely bred except at the Wildfowl and Wetlands Trust at Slimbridge, UK (B8). |
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