The Golden Eagle Trust, which was set up in 2001 to reintroduce golden eagles to Ireland after an absence of 100 years, says the project is in serious trouble after another eagle chick was found dead.
The eagle, called Conall, was hatched in Glenveagh National Park in April last year and was the first Donegal hatched chick to be fitted with a satellite reciever.
Its signall led to the eagle chick being found on February 18 on the side Truskmore, Co Sligo.
Test results have now confirmed that he was posioned.
Lorcan O Toole, from the Golden Eagle Trust, says that the eagle ate a dead lamb which had posion on it, probably meant for foxes or cows.