Just off the coast of Anglesey, Puffin Island (Ynys Seiriol in Welsh) is uninhabited and is designated a Special Protection Area on account of its large cormorant population.
Other sea birds such as guillemot, razorbill, shag, kittiwake and eider ducks are also found. Don't expect to see many puffins though as the puffins from which the island gets its name were decimated by the accidental introduction of rats in the late 19th century.
A poisoning programme to rid the island of its rats has helped the puffins recover in recent years.
Each summer, the RSPB organise wildlife cruises around Puffin Island with live commentary and you can see many of the birds listed above as well as gannets, chough, peregrine falcons and storm petrels.