Wildlife and nature
Yr Wyddfa is not simply a mountain to be climbed. It is a National Nature Reserve sheltering species found nowhere else in Britain — some of which have survived here since the last Ice Age and are now threatened by climate change.
Conservation designations
The Snowdon massif carries multiple overlapping conservation designations reflecting its exceptional ecological importance. It is designated a National Nature Reserve (covering 1,671 hectares), a Site of Special Scientific Interest, and a Special Area of Conservation under the EU Habitats Directive (retained in UK law post-Brexit). These designations protect not just the rare plant and invertebrate communities of the summit zone, but the glacially formed habitats, the upland grasslands, the acidic flushes, and the lake ecosystems of the wider massif.
The Snowdon Lily
Gagea serotina — the Snowdon Lily — is an Ice Age relict plant found in the United Kingdom only on a small number of inaccessible, north-facing calcareous cliff ledges on Yr Wyddfa. It was first documented by the Welsh naturalist Edward Lhuyd around 1688 and has been a botanically significant species ever since.
The total Welsh population is estimated at fewer than 100 bulbs, though precise counts are difficult given the inaccessibility of its preferred habitat. The plant is genetically distinct from continental populations and is considered by some botanists to be predicted to become the first British plant driven to extinction by climate change — the gradual warming of the mountain environment eliminating the cold niche it requires. It flowers in early summer (typically May to June) with small, star-like white flowers, and is protected under Schedule 8 of the Wildlife and Countryside Act 1981.
Its precise locations are not publicly disclosed, and its cliff-face habitat means it is not visible from any of the walking routes. Its significance is entirely ecological and conservation-based rather than something the average walker will encounter directly.
The Snowdon Rainbow Beetle
Chrysolina cerealis — the Rainbow Beetle or Rainbow Leaf Beetle — is an iridescent insect of extraordinary beauty: its wing cases shimmer with stripes of metallic green, red, blue, and gold in direct sunlight. In Britain it survives only on a few sites on the western flanks of Yr Wyddfa, with a total adult population estimated at around 1,000 individuals (highly variable and difficult to assess).
It is associated with wild thyme (Thymus polytrichus), its primary food plant, which grows on the thin, mineral-rich soils of the mountain’s western slopes. Like the Snowdon Lily, it is considered a relict of colder post-glacial conditions and its range has contracted as the climate has warmed. It is protected under Schedule 5 of the Wildlife and Countryside Act 1981 — making it illegal to intentionally kill, injure, or disturb it.
Birds
The mountain and its surrounding landscape support a range of upland bird species. The chough — a glossy black corvid with a distinctive red bill and legs — is one of Wales’s most celebrated birds and a regular presence in the Snowdon area. Wales holds approximately 60% of the UK’s chough population. The birds nest on cliff faces and feed on short-grazed grassland, making the mountain’s grazed upper slopes suitable foraging habitat.
Peregrine falcons nest on the cliff faces of the massif and are regularly observed from the higher walking routes, particularly above Glaslyn.Ravens are ubiquitous on the mountain, frequently appearing at the summit to investigate walkers’ food. Ring ouzels — upland cousins of the blackbird — breed on the steeper rocky slopes. Red kites, reintroduced to Wales in the 1990s, are increasingly common visitors to the wider area.
Arctic char and the Ice Age lakes
Llyn Padarn in Llanberis — one of the lakes in the valley below Snowdon rather than on the mountain itself — holds a population of Arctic char (Salvelinus alpinus), a cold-water salmonid that was stranded in the lake at the end of the last Ice Age when rising sea levels severed its connection to the sea. The fish has changed remarkably little from its glacial-period ancestors and is considered a living record of the post-glacial landscape. It is a SSSI feature of Llyn Padarn and its population is carefully monitored by Natural Resources Wales.
Upland plant communities
Beyond the Snowdon Lily, the mountain supports a range of upland and arctic-alpine plant communities of considerable scientific interest. Purple saxifrage (Saxifraga oppositifolia) — one of Britain’s earliest-flowering mountain plants — colours rocky ledges in March and April. Moss campion, roseroot, and various rare hawkweeds including Snowdon Hawkweed (Hieracium snowdoniense), endemic to Snowdonia and found nowhere else on Earth, occupy the upper cliffs and ledges. The Snowdon Hawkweed was long considered extinct but was rediscovered in the 1990s.
Responsible wildlife watching
The pressures of over half a million walkers annually have a measurable impact on the mountain’s ecology. Walkers are asked to stay on the established paths, not to pick any plants, and not to disturb nesting birds. The Rainbow Beetle’s western flank habitat is away from the main walking routes — there is no justification for leaving the path in search of it. Litter, dog fouling, and off-path erosion are the principal visitor-caused threats to the mountain’s wildlife and habitats.