Grassholm island, off the coast of Pembrokeshire, is home to a massive colony of Northern Gannets ([i]Morus bassanus[/i]), with 39,000 breeding pairs and a total of ca. 100,000 birds (including non-breeders). It is also a good site for breeding European Shags and Grey Seals.
This rock is the part of the colony where most of the courtship and pairing-off of young birds happens.
