Guillemot
Uria aalge
Tap image to enlarge · Wikimedia Commons
Overview
The Guillemot is the most abundant auk in the Irish Sea and the most likely to be seen from the Sefton Coast beach. They stand upright on sea-cliff ledges in spectacular breeding colonies — the nearest colonies are at South Stack, Anglesey. In winter, they disperse offshore and can be seen flying low over the Irish Sea in small groups. Their decline is linked to sandeel availability, oil spills and being caught in fishing nets.
At a Glance
| Order | Charadriiformes |
| Family | Alcidae |
| Habitat | Open sea · Offshore coastal water |
| Diet | Fish — principally sand eels and small clupeids — caught by diving |
| UK population | Around 950,000 pairs; amber-listed |
| Sefton Coast | Regular offshore in winter; most numerous auk off the Sefton Coast |
| Conservation | UK Amber List |
Where to See It
Offshore from Formby Point and Ainsdale beach. The most numerous auk in the Irish Sea.
Identification
Sleek brown-black above, white below. Pointed bill — more slender than Razorbill's heavy blunt bill. White trailing edge to wing. 'Bridled' form has white spectacle ring (common in northerly populations). Sits upright.
Viewing & Photography Tips
Scan from Formby Point — Guillemots are more numerous than Razorbills. The more slender bill and less blocky head distinguish them. They often sit in groups on the water.
Conservation Status
UK Amber List
This species is on the UK Amber List for Birds (BoCC5), indicating moderate concern. Population monitoring and habitat management remain important for its continued recovery.
Frequently Asked Questions
Why do Guillemots lay pear-shaped eggs?
Guillemots lay their single eggs on bare cliff ledges with no nest. The extremely pointed, pear shape of the egg means that if knocked, it rolls in a tight circle rather than off the ledge — a remarkable adaptation for nesting in one of the most precarious positions of any bird. The eggs also have extraordinarily variable individual markings, allowing parents to identify their own egg among hundreds on a crowded ledge.
Related Species
Plan your visit to the Sefton Coast
Marshside RSPB, Formby pinewoods, Ainsdale NNR — practical guides to getting there, what to bring, and the best spots for each season.