WTSWW’s marine monitoring work gathers evidence for critical datasets, used to strengthen the resilience of Wales’ network of protected marine sites and the protection of the marine species found within these sites. Long-term, uninterrupted datasets are particularly important to assess broad population trends, filling knowledge gaps, and informing decisions about use of the marine environment.

Lying in the Celtic Sea two miles off the southwest Pembrokeshire coast, Skokholm has its own charm and sense of remoteness with tall, sandstone cliffs and a wild landscape. The island is approximately half a mile across at its widest point and a mile in length which makes it perfect for exploring. There are never more than 26 people on the island, that’s 10 acres of space for every visitor!

Find out all about the wildlife of Skomer Island - one of the most important seabird sites in southern Britain. Its maritime grassland, lush inland vegetation, bubbling streams and man-made ponds support a host of wildlife including Atlantic Puffins, Manx Shearwaters, Guillemots, Razorbills, Skomer Voles and much more.

Please note, Puffins start arriving in mid-April. They are present from May-July. The first ones start leaving in mid-July and all Puffins are gone by the end of July.

With nearly 350,000 breeding pairs of Manx Shearwaters, over 40,000 Puffins, thousands of Guillemots, Razorbills and Kittiwakes and hundreds of Fulmars, Skomer is an internationally important seabird island.

It is located less than a mile off the beautiful Pembrokeshire coast making it a great place to visit for the day or stay overnight.

Please note, Puffins start arriving in mid-April. They are present from May-July. The first ones start leaving in mid-July and all Puffins are gone by the end of July. Please see our seasonal timeline below for what to see each month.