Mammals have filled the full range of niches available to them and may be specialist ….or generalist …. Ranging in size from the tiny pygmy shrew to the large red deer, wild mammals include species that walk, run, climb and even fly. Some are enigmatic and feature in our myths and legends. Others we think of as pests when their needs conflict with ours.

From the seed harvest rodents, to the browsers, such as deer, rabbits and hares, to carnivores, some specialist (weasel) and opportunistic (fox), to the highly specialised bats. In total in Wales there are about 45 species of free-ranging terrestrial mammals from 5 different Orders. They occupy most habitat types from the remote uplands to wooded valleys and aquatic environments such as rivers, streams and estuaries and some have adapted to share our dwellings.

Mammals adopt a range of survival strategies. Voles and rabbits are prolific breeders, but bats live for many years and produce at most one young per year. Dormice and bats hibernate when food supplies are low whilst squirrels do not hibernate, but can be less active in winter.

A number of mammals found in Wales are not native and have impacted on other native mammals, such as mink which escaped from fur farms and have had a devastating impact on the water vole, and grey squirrels (released by well-meaning Victorians and responsible for the decline of the red squirrel). Some mammals are extremely numerous (voles are estimated to number 75 million in Great Britain) and are regularly in contact with people within the houses (house mouse), gardens (moles) or in the wider countryside where some are considered to be a pest for one reason or another (e.g. fox). Others are very rare (barbastelle bat, pine marten) and declining (water vole) and hence of great conservation concern or unique to Wales (Skomer vole). Some have become extinct as a result of man’s activities with some people wishing for them to be reintroduced (beaver).

What they all have in common is that they give birth to live young which the mothers suckle with milk until they are able to fend for themselves. They are also a key part of the Welsh biodiversity. And they’re a good indicator of the health of our environment – the return of the otter to most rivers in Wales, for example, is a sign that our water courses are clean and provide plenty of fish and amphibians.

Sites of Special Scientific Interest (SSSI) are designated for important populations of otter, water voles and bat species. Otter are also a primary or qualifying feature of 13 Special Areas of Conservation (SAC)

Hare - Alun Williams

Mammal Orders and species in Wales

Chiroptera: bats – 15 species resident in Wales

Rodentia: rodents – 11 species

Carnivora: carnivores 8 species

Artiodactyla: even-toed ungulates – 6 species

Insectivora: insectivores – 5 species

Lagomorpha: hares and rabbits – 2 species

Mammal conservation in Wales

UK and international legislation protects our rarest mammals and UK and Local Biodiversity Action Plans (BAPs) guide actions for their conservation. A number of Welsh and UK organisations play an important role in mammal conservation and most are represented on the Wales Mammal Biodiversity Action Forum. These include Local Biodiversity Action Plan Partnerships, Local Environmental Record Centres, The British Association for Shooting and Conservation, The Bat Conservation Trust, The Mammal Society, Natural Resources Wales, The Vincent Wildlife Trust and The Wildlife Trusts of Wales, and Universities of Wales. See the Species Summary spreadsheet for a guide to which of Wales' mammals need conservation action.

The first official Red List for British Mammals, produced by the Mammal Society for Natural England, Natural Resources Wales, Scottish Natural Heritage (NatureScot) and the Joint Nature Conservation Committee, shows that 11 of the 47 mammals native to Britain are classified as being at imminent risk of extinction. Among those species listed as being at risk of extinction in Britain are the water vole, hedgehog, hazel dormouse, wildcat and the Grey long-eared bat. The European wolf is already extinct.

In Wales, the report shows that 1 in 3 species are threatened with extinction and 51% of mammal species need urgent action. Formerly widespread in Wales, red squirrel and water vole are assessed as endangered and hedgehog as vulnerable. For a full list of species on the Wales' list and their classification, download the summary report.


Wales Mammal Biodiversity Action Forum Secretariat

Liz Halliwell

The purpose of the Wales Mammal Biodiversity Action Forum is to:

  • Provide a forum for dialogue between statutory, voluntary organisations and LBAP partnerships involved in the delivery of conservation action for Wales mammal BAP species
  • Encourage awareness raising of mammal conservation issues and threats throughout Wales
  • Provide a link for the flow of information between local, regional, Wales and UK biodiversity action processes
  • Encourage the recording, reporting and dissemination of conservation status assessments of mammal species and ensure information is available for the purposes of informing biodiversity and public decision making processes
  • Promote best practice survey and conservation management
  1. WMBAF Terms of Reference April 2010 (pdf)
  2. WMBAF work programme 2013-14 (pdf)
  3. WMBAF updates 2010-2013 (pdf)


Bats are fascinating creatures and they play an essential part in ecosystem functioning and in particular the control of nocturnal insects such as mosquitoes, midges, moths and beetles. Bats rely on a matrix of suitable habitats and quality of the environment- requiring places to forage, roost, breed and hibernate and their presence are indicators of a healthy environment.

Wales supports 15 of the 18 species of bat in the UK and there are 10 Special Areas of Conservation (SAC) where bats are either a primary or secondary feature of the SAC. All bat species and their roosts are legally protected in the UK and all bats are listed as European protected species under the Habitats Directive. In addition, 8 bat species are listed on the Priority Species list for Wales (Section 7 list)

Common Pipistrelle

Actions for Bats in Wales

Bat Conservation Trust (BCT) runs the Wales Bat Project which works with volunteer bat groups throughout Wales, raising awareness of bats in Wales and coordinating bat conservation projects such as the National Bat Monitoring Programme. The Urban Bat project encourages volunteers new to bat surveying to map and record urban bat activity. The project was piloted in south Wales and more recently in north Wales. For further information and to take part contact Steve Lucas, BCT Wales Officer. BCT also takes an active advocacy role in influencing policy development, along with other environmental charities, to assist Welsh Government to help meet their national, international and EU obligations.


Steve Lucas: Wales Officer, Bat Conservation Trust, Swansea Environment Centre, Pier Street, Swansea SA1 1RY

Email: Steve Lucas

Phone: 01269 26 87 68

For help and advice about bats, or to find out more about the Bat Conservation Trust, please visit

Species in Wales

Amphibians & Reptiles



Terrestrial Mammals



Helping Wildlife

Wildlife Gardening