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Title: Ysbryd y Mwynwyr - Spirit of the Miners
Cwm YstwythYstrad EinionWheelhouse, Bryn yr Arian

Mines and Bats

The open shafts and adits and mine buildings are home to roosting and hibernating bats which make use of the shelter and stable temperatures in these structures.
Brown Long-eared bat

Cwmystwyth Mine is the best known location for hibernating bats in Ceredigion where Daubenton's, Natterer's, Brown long-eared and Whiskered/Brandts bats are regularly present during the winter months.
• The lesser horseshoe bat has recently been found in a North Ceredigion mine the first record of this species in the County since 1926.
• Other rare species particularly the greater horseshoe are also in the area. They were known from the Devils Bridge area in the early part of last century and were using Frongoch in the last 20 years. One has been found feeding in the Rhiedol valley in recent years.

Daubenton Bats

• It is not only as winter accommodation Cwmystwyth and other mines are used by bats.
• There is considerably more use of underground sites as 'swarming' or mating areas in the late summer and early autumn. Swarming is as yet a little understood activity but is thought to be important for mating and the identification of suitable hibernacula.
• Regionally such places are very important and bats will travel 30 to 40 miles and more to suitable locations.

Natterer's Bats

• In the night very large numbers of bats will gather to swarm and enter the mine but by dawn most will have gone.
• Curiously their need for protected flight line seems to break down when travelling to underground sites as many important places are in remote isolated or desolate locations.
• Perhaps this is a measure of their importance but most old mines in the area have never been assessed for this activity.
• A number of anecdotal accounts suggest Cwmystwyth is both a swarming site and night roost particularly for Natterer's bats.
Night roosts are places where bats may gather in the night after feeding.