5 May 2011
Last updated at 12:17
Skokholm Island, three miles off the Pembrokeshire coast, was the site of the UK's first bird observatory. It is owned by the Wildlife Trust of South and West Wales and is a national nature reserve
In the 1980s, a collection of intricate paintings of rare species began to appear on the whitewashed walls of the island's only toilet block. The colourful paintings quickly became a beloved pastime of birdwatchers visiting the island, who used them to celebrate rare or colourful sightings like this Monarch butterfly
This black-winged stilt is believed to have been spotted on the island's North Pond in the 1970s or 1980s. Sadly the walls of the toilet began to decay due to damp.
Jerry Gillham recalls this black stork visiting the island between the 27-28 April 1991. He said "It arrived at dusk and sheltered overnight. Departed early in the morning being mobbed by many gulls."
The sighting of this kingfisher dates from around 2000, when it was spotted from the jetty on a sunny afternoon by the then assistant warden, Lisa, and two volunteers.
This glossy ibis was painted on 19 June 1996. Sadly the paintings, which number more than 100, were destroyed with the damp wall of the toilet block, which has now been replaced.
The wildlife trust is urging twitchers to continue the popular tradition in refurbished block, so colourful likenesses like this little egret can still be shared among enthusiasts
The sighting of this bobolink marked a first for Wales on 13- 14 October 1999. It arrived on the island during westerly winds following a hurricane in eastern USA and became Skokholm's first official twitch