- Lifespan
- 15–20 years in the wild; can exceed 25 years in captivity
- Size & Weight
- 140–160 cm long, wingspan 200–240 cm; 7–15 kg (males heavier than females)
- Habitat
- Found on lakes, rivers, ponds, estuaries, and coastal waters with shallow margins and aquatic vegetation.
- UK Distribution
- Resident throughout England, Wales, and lowland Scotland; populations augmented by continental migrants in winter. Absent from upland areas and the far north.
- Diet
- Primarily aquatic vegetation including pondweeds, algae, and submerged plants; also grazes on grass and crops near water.
- Predators
- Foxes, mink, and crows may prey on cygnets; adult swans rarely taken due to large size and aggressive defence.
- Mating Season
- February to June, with peak activity April to May
- Breeding
- Clutch of 4–8 eggs; incubation period 35–41 days; typically one brood per year. Both parents fiercely defend nest and young.
- Behaviour
- Highly territorial during breeding season; monogamous pairs often remain together for life. Aggressive towards other swans and intruders; cygnets remain with parents for 4–5 months. Strong fliers despite their size.