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However, the main source of damage to swans and cygnets is poisoning caused by lead weights discarded, or lost, by fishermen.
The figures for the past three years are: 3,000 cygnets and 6,000 older birds.
The symptoms of lead poisoning are seen not only in the white swans over one year old but in the cygnets of only a few weeks.
The cygnet has a light grey plumage with black bill and feet.
Selected wild cygnets had their wings clipped and bills cut into a distinctive pattern bearing the owner's mark.
The cygnet is a patchy color, with brown and gray hues.
The cygnets hatch after about 36 days and have a grey or brown plumage.
The cygnets (juveniles) are grey in appearance, becoming white after the first year.
Visitors are sometimes allowed to hold the cygnets under supervision from the swanherds.
Today, only swans with cygnets are caught and ringed.
Also, unlike most wildfowl, both parents regularly carry the cygnets on their backs.
The group of two birds, presumably an adult pair, can be identified as corvids, perhaps ravens, the family of five as swans and cygnets.
Male swans have been known to display aggressive behavior in order to protect their families, but such behavior generally decreases as the cygnet grows older.
Young birds, called cygnets, are not the bright white of mature adults, and their bill is dull greyish-black, not orange, for the first year.
The cygnets can fly at an age of 120 to 150 days.
