Thousands of birds including Stonechats, Whitethroats, Linnets, Blackbirds, Dunnocks and Meadow Pipits have been decimated in the middle of the nesting season.
Niall Hatch of Birdwatch Ireland said the fires have wiped out many species and many will find it difficult to breed again.
“We have only got over two hard winters which has left the numbers of birds well down.
“But these fires have now decimated many species. We are in the middle of the nesting season and tens of thousands of chicks and eggs have been destroyed.
“Birds like the Stonechat, the Whitethroat as well as more common birds like Linnets and Blackbirds have been decimated because of the fires,” he said.
“There’s no question that cuckoo numbers will now also be under threat,” he said.
And Mr Hatch also revealed how birds which survived the fires will also find food scarce after millions of insects and other food supplies were also destroyed in the infernos.
“These fires are going to have a huge knock-on effect for many years to come. And the loss of a large section of the food chain including insect life will upset the entire food chain.
“Thankfully no human life has been lost but the impact on wildlife has been enormous and that is often overlooked,” he said.