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In addition to Northern Gannet there are breeding Common Guillemot and Razorbill, Shag, Kittiwake, Herring Gull and Great Black-backed Gull. Oystercatcher breed on the shingle beaches. Atlantic Puffin formerly bred in large numbers but their burrowing led to collapse of the soil and although they now longer breed, small numbers may still be seen in summer when Manx Shearwater is also present offshore.
Birds you can see here include:
Grey Seal are common in the seas around the island.
History and Use
Areas of Interest
Access and Facilities
Landing on Grassholm is possible only in very calm weather and not permitted until after 15th June. However, there are boat-trips available which sail around the island from April onwards from Martinshaven.
Approved Boat Trips:
Thousand Islands Expeditions run guided trips to Grassholm, from St Justinains (1 mile west of St Davids) and run every day (weather permitting) from 1 June to 30 September. To book please contact:
Thousand Islands Expeditions
Tel: 01437 721721 or 721686 
RSPB Ramsey Island St Davids SA62 6QA Telephone: 07881 846498
Content and images originally posted by Steve