The site is an important breeding location for several species of seabird including great and lesser black-backed gull, European storm petrel, Atlantic puffin, common tern, shags, herring gull, cormorant and oystercatcher, fulmar and ringed plover. There are approximately 8,000 pairs of northern gannets on Les Etacs and Ortac, representing more than 2% of the world’s northern gannet population. Aside from seabirds, the Ramsar Site supports a diversity of marine species, such as sea anemones, kelp, sea urchins and ormer.