Wildlife Ireland – Native Species, Monitoring and the Conservation Challenges Ahead

Wildlife Ireland encompasses a distinctive but relatively small community of native species, shaped by the country’s island geography, Atlantic climate and post-glacial history. With around 30 native land mammal species, just one native reptile, two native amphibians and approximately 200 breeding bird species, Ireland’s fauna is less diverse than that of continental Europe – but what it lacks in numbers, it makes up for in ecological significance. Several Irish populations represent the most westerly outposts of their species in Europe, and some are subspecies found nowhere else. This guide covers the state of Ireland’s wildlife, the monitoring programmes that track it, the conservation successes that offer hope and the failures that demand urgent action.

The headline picture is one of mixed fortunes. Some species – particularly raptors and the pine marten – have recovered dramatically in recent decades. Others, especially farmland birds, freshwater species and pollinators, continue to decline at alarming rates. The biodiversity crisis in Ireland is not abstract – it is playing out in real time across specific species, specific habitats and specific landscapes. Understanding which species are thriving, which are declining and why is essential to directing conservation effort where it matters most.

🦌 Mammals

Ireland has approximately 30 native land mammal species – a relatively low number explained by the fact that land bridges connecting Ireland to Britain and the continent were submerged by rising sea levels after the last ice age before many species could colonise.

The Irish hare (an endemic subspecies of the mountain hare) is widespread but declining in parts of its range due to agricultural intensification and habitat loss. The red deer have a native herd only in Killarney National Park – the only truly wild, genetically pure native red deer population in Ireland. Elsewhere, red deer populations include animals of introduced or hybrid origin, and hybridisation with non-native sika deer threatens the genetic integrity of the Killarney herd.

The pine marten is one of Ireland’s great conservation success stories. This native predator was reduced to a tiny remnant population in the west of Ireland by the early 20th century but has since recovered spectacularly, expanding its range across most of the country. The pine marten’s recovery has had a remarkable knock-on effect on another conservation challenge: where pine martens are present, grey squirrel populations decline, allowing native red squirrels to recover. This natural “biological control” effect is one of the most positive ecological developments in Ireland in recent decades.

The otter is widespread in Ireland and holds one of the strongest populations in Europe, found along rivers, lakes, estuaries and coasts. It is protected under the EU Habitats Directive. The badger is common across most of the country but remains controversial due to the government’s badger culling programme, which aims to reduce transmission of bovine tuberculosis to cattle. The hedgehog, once ubiquitous in Irish gardens and farmland, is declining due to habitat loss, pesticide use and road mortality.

Ireland supports nine resident bat species, all protected under both Irish and EU law. The Lesser Horseshoe bat is of particular significance – Ireland holds one of the largest populations of this species in Western Europe, concentrated in the west of the country. The National Bat Monitoring Programme tracks population trends through roost counts and detector surveys.

🐦 Birds

Farmland Birds – The Sharpest Declines

Farmland birds represent the fastest-declining group in Ireland, driven by agricultural intensification, loss of hedgerows and field margins, drainage of wet grassland and the increasing uniformity of the farmed landscape. The curlew is the most urgent case. Breeding curlew in Ireland have suffered an estimated 96-99% decline since the 1970s, with just 138 pairs recorded during the 2015-2017 NPWS national survey. The species is now on the brink of extinction as a breeding bird in Ireland. Emergency interventions include the Breeding Wader EIP, which supports farmers to manage habitat for ground-nesting birds, and a headstarting programme at Fota Wildlife Park. The headstarting programme, launched in 2024, involves collecting curlew eggs from the wild, incubating them and rearing chicks in biosecure facilities before release. In its first year, 27 headstarted curlew fledglings were successfully released into the wild, and the programme continued into 2025 with the aim of building on that foundation.

The corncrake, once widespread across Irish farmland, is now restricted to the Shannon Callows and parts of the northwest. Its distinctive rasping call, once a soundtrack of the Irish summer, is barely heard today. The yellowhammer, skylark and meadow pipit have all declined significantly, while the corn bunting has been extinct in Ireland since the 1990s. Only one known pair of ring ouzel remains.

Raptors – A Recovery Story

Against the backdrop of farmland bird decline, Irish raptors have staged a remarkable recovery. The buzzard, absent from much of Ireland for over a century, has naturally recolonised from a remnant population in the northeast and is now common across the country. The peregrine falcon, which suffered catastrophic declines due to pesticide poisoning in the mid-20th century, has recovered strongly and now nests in both rural and urban settings. The sparrowhawk is thriving.

The hen harrier, however, bucks the raptor recovery trend. The 2022 national survey found just 85-106 breeding pairs, a decline of approximately one-third since the 2015 survey and a fall of more than 50% since the first national survey in 1998-2000. The species breeds almost exclusively in upland habitats where it faces competing pressures from forestry, agriculture, renewable energy development and recreation. Populations have dropped by between 20% and 80% in five of the six Special Protection Areas designated for the species. A Hen Harrier Threat Response Plan is in development.

Species reintroductions have added new chapters to Ireland’s bird story. The white-tailed eagle programme, completed in August 2025 after releasing 245 birds over 18 years, has established a self-sustaining population of approximately 150 eagles with 17 known breeding pairs. Golden eagles and red kites have also been successfully reintroduced.

🦎 Reptiles and Amphibians

Ireland has the simplest herpetofauna of any European country. The common lizard is Ireland’s only native reptile – there are genuinely no native snakes (this is a consequence of post-glacial isolation, not St Patrick). Two native amphibians are present: the common frog, found throughout the country, and the smooth newt, which is widespread but secretive and often overlooked.

The natterjack toad is Ireland’s rarest amphibian and one of its most protected species. Restricted to a small number of sites in County Kerry – primarily around Castlemaine Harbour and the Dingle Peninsula – the natterjack is at the extreme northwestern edge of its European range. Its conservation requires active management of breeding ponds and sandy habitat, and the species is the focus of a dedicated NPWS programme.

🐟 Freshwater Fish and Invertebrates

Atlantic salmon populations have declined across Ireland, mirroring trends across the species’ range in Europe and North America. Factors include changing ocean conditions, barriers to migration, water quality degradation and overfishing at sea. Inland Fisheries Ireland manages salmon stocks through quota restrictions and conservation measures, including mandatory catch-and-release on many rivers.

The freshwater pearl mussel is among the most critically endangered species in Ireland. This long-lived animal (some individuals survive over 100 years) requires clean, fast-flowing, well-oxygenated rivers with clean gravel beds for reproduction. Decades of water quality decline, sedimentation and habitat degradation have pushed the species to the brink. The EPA has prioritised 10 towns where wastewater treatment must improve specifically to protect freshwater pearl mussel populations downstream.

Arctic char, an ice age relic found in deep, cold lakes, is another species of conservation concern, threatened by warming water temperatures and eutrophication. Lamprey species (river, brook and sea lamprey) are protected under the EU Habitats Directive and depend on clean rivers with natural substrates. The European eel is classified as critically endangered globally and has declined dramatically in Ireland.

🐝 Invertebrates – The Overlooked Majority

Invertebrates account for the vast majority of Ireland’s biodiversity but receive a fraction of the attention and resources devoted to birds and mammals. The finding that one in three wild bee species in Ireland is threatened with extinction, reported through the National Biodiversity Data Centre, was a landmark moment in raising public awareness of invertebrate decline. The All-Ireland Pollinator Plan, now in its third phase (2021-2025, extended with Shared Island funding to 2026-2030), has mobilised local authorities, communities, farmers and businesses to create pollinator-friendly habitats across the landscape.

The Irish Butterfly Monitoring Scheme tracks trends through volunteer-based transect walks. Dragonflies and damselflies are monitored and mapped, and moth recording has increased significantly through automated traps and citizen science. However, huge knowledge gaps remain for many invertebrate groups – beetles, flies, spiders, soil organisms – that are ecologically critical but largely unstudied in Ireland.

🏆 Conservation Successes and Failures

What Has Worked

The pine marten recovery demonstrates that native species can bounce back when persecution ceases and habitat connectivity improves. The white-tailed eagle reintroduction shows that well-planned, long-term species recovery programmes can succeed. The otter’s stable population reflects the benefits of legal protection and relatively widespread suitable habitat. Peregrine falcon and buzzard recoveries illustrate how removing specific threats (pesticides, persecution) can allow populations to recover rapidly.

What Continues to Fail

The curlew collapse is Ireland’s most visible conservation failure – a species that was widespread within living memory is now heading for extinction as a breeding bird despite designated conservation areas and targeted interventions. Farmland bird declines more broadly reflect the fundamental incompatibility between intensive agriculture and biodiversity. The freshwater pearl mussel continues to decline despite EU legal protections and targeted wastewater improvements. The hedgehog decline, largely unmonitored and poorly understood, may represent a wider pattern of under-the-radar losses across common species.

🔮 What Comes Next

The National Biodiversity Data Centre is increasingly central to Ireland’s wildlife monitoring infrastructure. Its citizen science platforms enable thousands of people to contribute species records that underpin policy decisions, from the All-Ireland Pollinator Plan to Habitats Directive reporting. The next Habitats Directive reporting cycle in 2025 will provide an updated picture of how Ireland’s protected species and habitats are faring.

The direction of travel for Irish wildlife conservation will be shaped by the same forces affecting all of Ireland’s natural environment: agricultural policy, climate change, development pressure and the level of investment in nature protection. The EU Nature Restoration Regulation creates new legally binding obligations to reverse the decline of pollinators and restore degraded habitats. Ireland’s €3.15 billion Climate and Nature Fund, announced alongside the regulation, will partially fund these efforts. But the scale of the challenge – from the curlew on the brink to the pearl mussel in its declining rivers – requires a step change in how Ireland values and protects its native wildlife.

For more on the habitats these species depend on, see our guides to peatlands, native woodlands, water quality and marine conservation. For the species that threaten native wildlife, see our guide to invasive species. And for how natural processes can be restored at landscape scale, see our guide to rewilding in Ireland.