The smaller of the two islands is Little Skellig (Sceilg Bheag in Irish). (grid reference V268618) It is closed to the public, and as well as being Ireland's largest northern gannet (Morus bassanus) colony with almost 30,000 pairs, it is also one of the world's largest, and is of international importance. The island is 134 m tall and is approximately 1.5 km eastnortheast of Skellig Michael.
Also known as Great Skellig (Sceilg Mhichíl in Irish), this is the larger of the two islands, with two peaks rising to over 230 m above sea level. With a sixth-century Christian monastery perched at 160 m above sea level on a ledge close to the top of the lower peak, Great Skellig is designated as a UNESCO World Heritage Site.
Birdwatch Ireland were concerned that the Irish government allowed filming on a seabird sanctuary without third party consent. During the 2014 nesting season, black-legged kittiwake chicks in nests were swept into the sea by the downdraught from a helicopter and devoured by gulls.
Both of the Skellig islands are known for their seabird colonies, and together comprise one of the most important seabird sites in Ireland, both for the population size and for the species diversity. Among the breeding birds are European storm petrel (Hydrobates pelagicus), northern gannet, northern fulmar (Fulmarus glacialis), Manx shearwater (Puffinus puffinus), black-legged kittiwake (Rissa tridactyla), common guillemot (Uria aalge), razorbill (Alca torda) and Atlantic puffin (Fratercula arctica) (with 4,000 or more puffins on Great Skellig alone). Red-billed chough (Pyrrhocorax pyrrhocorax) and peregrine falcon (Falco peregrinus) can also be seen.
The surrounding waters have abundant wildlife with many Grey seal (Halichoerus grypus). Basking shark (Cetorhinus maximus), minke whale (Balaenoptera acutorostrata), dolphin (Delphinidae), beaked whale, and leatherback sea turtle (Dermochelys coriacea) have also been recorded. The islands have many interesting recreational diving sites due to the clear water, an abundance of life, and underwater cliffs down to 60 meters (200 feet).
The final scene of Star Wars: The Force Awakens was shot on Skellig in July 2015, with additional filming taking place there in September 2015. The remains of the Skellig Michael monastery appear in the film, representing an ancient Jedi temple.
Earlier, the Skellig Islands served as a location in the Werner Herzog 1976 movie Heart of Glass, where the islands feature in one of the prophecies by the seer Hias.
Certain scenes from the 2012 movie Byzantium were also filmed here.