In Ardeley there is a Church and a Farm. Bats may well be living in both.
All 18 species of bat found in the UK are protected, as their natural habitats have been disappearing. As mature trees are cut down, these small creatures, the only flying mammals, need places to live which suit their natural behaviour.
A long eared bat eating a meal worm
Caves would be good and holes in trees are ideal so you can see how a large hole in a dark tower holding a bell might work.
As flying is such hard work a bat has to eat a third of its body weight each night to survive, and that might mean 3,000 midges!!!
As part of the conservation work on the farm, bat boxes can be seen and hedgerows still exist and provide plenty of food stuff for bats on their nocturnal ventures. Bats can see, but they hunt at night and use echolocation to find their prey and avoid flying into trees at high speed.
Man has made use of this technique to develop sonar and has invented bat detectors which convert the sounds bats make, which we are unable to hear, into something we can hear.
Only three species of bats eat blood and none are found in Transylvania at all, so Bram Stoker may have made up some of his book involving a certain Count Dracula. Thankfully, those three species are also not found in the UK, so those of us sleeping at the Farm can sleep safely in our beds!!!!!!