 Two small islets , close to the island , called Lissroy and Lihoumel , are breeding places for a number of endangered species of birds , including Eurasian oystercatchers and common ringed plovers . Numerous other species of birds and plants are found on Lihou such as peregrine falcons and sea storksbill . The Guernsey Environment Department does not allow visitors to go to the two islets and the shingle bank at certain times of the year in order to allow the birds to breed . Approximately 800 metres ( 2 @,@ 600 ft ) north of the island is a submerged ledge called Grand Etacre , which was considered to be a hazard to navigation in the nineteenth century . 
