Natural History
Rathlin is of prehistoric volcanic origin, having been created as part of the British Tertiary Volcanic Province.
Rathlin is one of forty-three Special Areas of Conservation in Northern Ireland. It is home to tens of thousands of seabirds, including common guillemots, kittiwakes, puffins and razorbills – about thirty bird families in total. It is a popular place for birdwatchers, with a Royal Society for the Protection of Birds nature reserve offering spectacular views of Rathlin’s bird colony. The RSPB has also successfully managed natural habitat to facilitate the return of the Red-billed Chough. Northern Ireland's only breeding pair of choughs can be seen during the summer months. The cliffs on this relatively bare island are impressive, standing 230 feet (70 m) tall. Bruce's Cave is named after Robert the Bruce, also known as Robert I of Scotland: it was here that he was said to have seen the famous spider which is described in Cultural depictions of spiders. The island is also the northernmost point of the Antrim Coast and Glens Area of Outstanding Natural Beauty.
Recently the Maritime and Coastguard Agency of the United Kingdom and the Marine Institute of Ireland undertook bathymetric survey work in the area north of County Antrim, updating Admiralty charts (Joint Irish Bathmetric Survey Project). In doing so a number of interesting submarine geological features were identified around Rathlin Island, including a submerged crater or lake on a plateau with clear evidence of water courses feeding it. This suggests the events leading to inundation - subsidence of land or rising water levels - were extremely quick. Marine investigations in the area have also identified new species of anemone, rediscovered the fan mussel (the UK's largest and rarest bivalve mollusc - thought to be found only in Plymouth Sound and a few sites off the west of Scotland) and a number of shipwreck sites, including HMS Drake (1901), which was torpedoed and sank just off the island in 1917.
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