Grassholm Island National Nature Reserve

Grassholm Island National Nature Reserve, located 13 kilometres off the southwestern Pembrokeshire coast, is an uninhabited island renowned for its significant northern gannet colony, which comprises around 39,000 breeding pairs. Owned by the Royal Society for the Protection of Birds since 1947, it is one of the oldest reserves in the UK and the third most important site for gannets globally. The island's rugged terrain and turbulent surrounding waters also provide a habitat for porpoises and bottlenose dolphins. For wildlife enthusiasts, June is the prime month to visit Grassholm, particularly to observe the impressive gannet population. Sightings peak around 01:00, making this the best time for viewing. Other notable species include the Balearic shearwater and kittiwake, which can be spotted in September, while the great black-backed gull peaks in August. Although public access is restricted, boat trips from St Davids Lifeboat Station and Martin's Haven offer a chance to appreciate this remarkable reserve from the water.