An area of Kerry which is part of the Curlew Conservation Programme has not seen fledglings reared in the past three years.
The Curlew Task Force says policies and activities causing habitat loss must be urgently addressed in The Stack's Mountains.
The Curlew Conservation Programme was established in 2017; the bird is critically endangered with only 64 pairs left.
This year nine geographical areas that are important breeding grounds for the curlew were identified, including the Stack's Mountains in Kerry, with a locally based team assigned to each region.
The ground-nesting bird must contend with natural predators, destruction of habitat through fires, dog walkers, quads and scramblers.
This year the breeding success rate was at least 33%; nest protection fences were erected at the nine sites.
However, an incident involving a large number of people collecting turf using a dumper on a wet shaky bog on the Stack's Mountains led to a pair of curlews abandoning their nest.
The Kerry breeding site has not had fledglings reared in the past three years with illegal fires being a major issue, two chicks were also lost to a drainage ditch on rough terrain.
The project says decades of afforestation have also created a fragmented landscape and allow for an increase in predators such as foxes.
The Curlew Task Force says policies, circumstances and activities leading to habitat loss need to be urgently addressed if the breeding curlew is to remain a sigh and sound in Kerry.
