From nest building in February to the first flights of autumn, the swan family year is a story of devotion, challenge and survival.
We’ve brought together the journey step by step, with real experiences from our rescues here in Milton Keynes. From oil pollution destroying a nest to a young cygnet crash landing on the M1, these stories show just how much swans go through in a single year.
Read on to see why every rescue matters.
Swans capture people’s hearts because of their beauty, loyalty, and devotion to their young. Every year, pairs across Milton Keynes begin the same remarkable journey, raising the next generation of cygnets. For MK Swan Rescue, this cycle shapes much of the work we do. Each stage brings new risks, and our team is ready to step in whenever swans need help.
Nest building
The breeding cycle begins with nest building. The earliest pairs may start as early as February, with most following from March onwards.
The cob (male) begins the nest, gathering and piling up reeds, grasses, and other vegetation. Once the pen (female) accepts his efforts, she helps him finish shaping and lining it. Only when the nest is ready will egg-laying begin. The strength and position of the nest are vital to the success of the breeding season.
Swans will use whatever materials are available. When natural vegetation is scarce and human rubbish is plentiful, they collect plastic bags, food wrappers, or bottles. These items can trap cygnets or even the adults themselves. Junk offers no safety, but swans cannot tell the difference.
Nests are also at risk from flooding, disturbance by dogs, and human interference.
Our experience: Sydney and Wilma, Ashland Lake, April 2025
In April 2025, Sydney and Wilma’s nest at Ashland was destroyed when illegally discarded oil contaminated their lake. The oil stripped away their waterproofing and ruined their first clutch of eggs. It was a devastating reminder of how quickly human carelessness can undo weeks of work for swans.
Mating and eggs
With the nest prepared, the pair begin mating. Swans mate in the water, and repeated matings are needed to ensure a full clutch of fertile eggs.
A typical clutch contains five to seven eggs, though larger or smaller clutches do occur. Eggs are laid one at a time, usually every other day, until the clutch is complete. The pen begins incubation only after the last egg is laid, so the cygnets hatch together around six weeks later.
It is an offence to damage or destroy a swan’s nest or eggs while they are in use, yet we are still called to cases where nests are tampered with or eggs interfered with.
Hatching and fluffies
After around six weeks of incubation, cygnets hatch. This is when “fluffy season” begins. Parents keep their brood close, warming them under their wings and protecting them from threats.
Cygnets cannot waterproof themselves at first. For the first few weeks they rely on their parents’ preen oil, often riding on their backs to stay safe and dry.
Losses are common. Gulls, herons, and crows will take cygnets, while foxes hunt from land and otters or mink attack from the water. Rats steal eggs before they can hatch. Pollution, disease, and separation from the family bring further risks.
Although a pair may start the season with five to seven cygnets, on average only two or three will survive to fledging. Fewer still reach adulthood, which is why every successful rescue matters.
Growing up
Cygnets grow quickly. They begin to feed themselves, often helped by their parents, who stir up food from the lake bed. As families expand their territory, they may clash with neighbouring swans.
Territorial fights are common. Adult swans defend their space aggressively, and cygnets can be injured, separated, or even killed. Sadly, we see many lost this way each year.
Some cygnets also become overly confident and stray too far from their families. Without the adults’ protection, they are more vulnerable to predators and other dangers, and often need rescuing to survive.
First flights
By late summer into autumn, cygnets are strong enough to attempt flight. This stage is one of the most dangerous. Young swans often misjudge their landings and end up on roads, car parks, or small garden ponds.
MK Swan Rescue frequently responds to calls of “a swan on the road” at this time of year. These birds need to be caught and relocated to safe water.
Our experience: motorway rescue
In wet weather last year, one cygnet crash-landed on the M1 motorway. Traffic officers saved it from danger and called us for help. The youngster was admitted into care, but sadly lost sight in one eye. Despite this, it survived and now lives happily in long-term sanctuary care. This shows how dangerous the first flights can be, but also how teamwork between the public, emergency services, and MK Swan Rescue can give a swan a second chance.
Our experience: first flight tragedy
Not all stories end in rescue. Last year, another young cygnet was killed on the road beside the very lake where she had hatched. Chased away by her parents, she attempted her first proper flight and collided with traffic. It was a stark reminder of how perilous this stage of life can be.
Winter survival
By the time winter arrives, many parent swans have already driven their cygnets away in preparation for the next breeding season. Some families remain together longer, but most young birds have been chased off. These expelled cygnets often join flocks of non-breeders or drift between waters in search of safety.
Winter brings new challenges. Food is scarce, disease spreads more easily in cold, wet conditions, and ice can trap or injure swans.
We are often called during cold spells to check on swans stuck on frozen lakes or to help weakened birds. Responsible feeding can make the difference between life and death when natural food is limited.
Becoming independent
By the following spring, the parents are fully focused on breeding again. Any remaining cygnets are driven away to find their own territories.
This is another high-risk time, with “teenage” swans often found on busy roads, in unsuitable water, or caught in territorial disputes. These are regular rescue call-outs for our team.
A year in the life
The swan family year is a story of devotion, challenge, and survival. From nest building to the day the young birds fly off alone, every stage carries risks that can and do lead to rescues.
At MK Swan Rescue we follow this cycle closely. By understanding the pressures swans face throughout the year, we can be ready to help when things go wrong, and we can share that knowledge so the community knows when and how to step in.