Members of the public have been warned not to touch any dead birds after the discovery or another dead swan in mysterious circumstances.
Rangers from the National Parks and Wildlife services, wearing protective suits and face-masks, recovered the dead bird at Mullaghduff.
It had been spotted by a member of the public while out walking.
It follows the gruesome discovery of 32 dead swans in Dunfanaghy last weekend.
There are now fears the birds could have died from a form of bird flu although nothing has been confirmed.
The remains of the 32 swans found at New Lake have been sent to laboratories in Co Sligo for analysis.
Today’s discovery will heighten fears that whatever is killing the birds could be contagious.
It is not known if whatever is killing the birds can be harmful to humans.
Water samples have also been taken and poisoning is also being considered as a possible cause of death.
It is not known if the dead bird found today was part of the original flock from Dunfanaghy which died over a four week period.
Niall Hatch of Birdwatch Ireland said it was a most unusual event that such a high number of swans would die at one specific location.
“It would suggest some form of toxin or poisoning was to blame. We would be very anxious to know what killed these majestic birds,” he said.
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