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The word "Skerry" is the Scottish diminutive of the Old Norse word "sker", meaning a small rocky reef or island.

An old bridge from the mainland of Anglesey used to provide a supply route but this has long gone and the only way of reaching the islands nowadays is by boat.

The main island has a striped lighthouse dating from 1717 and a couple of out buildings.

The only people living on the island are the two RSPB wardens, who spend around three months of the year here monitoring the tern population.

The skerries are home to a vast number of arctic terns with a smattering of common terns thrown in for good measure. The birds have no predators here other than gulls so nest everywhere in makeshift nests.

The terns regularly 'dread' which involves 1000's of them flying and swooping 'en masse' out to sea for a few circles and then back again, bickering and pecking one another as they go.

Other wild visitors to the island include oyster catchers, great backed backed gulls, herring gulls, puffins, rock pipits, peregrine falcons and common seals.

Visitors are not allowed to actually step foot on the islands but boat trips are available and it's well worth going, to see the terns.