The rangers also recover a heron and two gulls, while Defra investigates if it is bird flu.
Swan can often be seen in the Brundon Lane area of the River Stour in Sudbury, on the Essex/Suffolk borderSudbury Common Lands Charity said the birds were recovered from the Brundon Lane area of the River Stour this week.
Defra said wild birds were susceptible to a "range of diseases and injuries" and not all dead birds would have been infected with avian influenza.
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