Britain's population of some 6,600 greater horseshoe bats (Rhinolophus ferrumequinum) is restricted to south and west Wales and south-west England, although individual bats are still recorded as far away as Surrey and Leicestershire.
The lesser horseshoe bat (Rhinolophus hipposideros) is now restricted to Wales, the west midlands and south-west England, but in the early 1900s it was found as far north as Yorkshire and east along the south coast of England to Kent. The size of the British population at that time is unknown, but is certain to have been much higher than today’s estimate of about 18,000 individuals.
Of the two species, only the lesser horseshoe bat is found in Ireland where an estimated population of between 9,000 and 10,000 individuals is restricted to the mid-west and south-west of the country.
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