Terrestrial and Freshwater Species in Peril in Wales: Species in Peril report
November 28, 2025

Terrestrial and Freshwater Species in Peril in Wales: Species in Peril report
The ‘Species in Peril’ report makes Wales the first country in the UK to identify its rarest species based on how geographically limited they are, rather than using traditional assessment methods.
Since the millennium, eleven species have already become extinct in Wales, including the Turtle Dove and Belted Beauty moth. The new report identifies species that have declined to near extinction, including the Arctic-Alpine Pea Mussel, Woolly Feather-moss and Eyed Chestnut Wrinkle-lichen.
NRW’s report highlights that almost half of the 2,955 identified species in Wales are restricted to single locations, underlining the need for urgent action to halt and reverse the decline in biodiversity, and to build the resilience of our ecosystems.
The report also finds that many of the species in peril can be better protected through modest and cost-effective steps.
Wales holds a unique responsibility for 56 species, that are found nowhere else in the UK. This makes the work internationally significant for biodiversity conservation.
The report categorises each species by why it is considered to be in peril - whether through decline, natural rarity, under-recording, being at the edge of its range, or being a species that has recently spread into Wales. The report then assesses each species against 17 key threats including habitat loss and climate change.
NRW is already taking proactive steps to reverse biodiversity decline through Natur am Byth, Wales’ flagship Species Recovery programme. This partnership brings together nine environmental charities with NRW to deliver the country’s largest natural heritage and outreach initiative, focused on saving species from extinction.
Alongside this, NRW is improving and connecting habitats across Wales through the Welsh Government-funded Nature Networks Programme. This £26.6m programme tackles the nature emergency by boosting biodiversity, improving the condition of protected sites, and strengthening the resilience and connectivity of habitats and species. The report highlights the importance of protected sites for species with 75% (2,222 species) occurring on SSSIs, and 47% (1,402 species) restricted to SSSIs and 35% (1,047 species) occurring on National Nature Reserves (NNRs), and 12% (353) restricted to NNRs.
The findings of the report will inform how Natural Resources Wales manages Special Sites of Scientific Interest and contribute to Wales' State of Natural Resources Report. The report findings have been shared with NRW’s on-the-ground conservation officers to help inform their work.
The Species in Peril approach could serve as a template for nations worldwide, demonstrating how to identify threatened vulnerable species that traditional assessments might miss and coordinate conservation action at a national level.
Read the Species in Peril report.
Text sourced from NRW
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