The activity, taking place at Earlswood Lakes in Warwickshire on Friday 23 September, is being organised by the Trust, working with Earlswood Wildlife Partnership.
The event is open to all and includes a talk with the Trust's resident ‘bat man', ecologist Paul Wilkinson, and a walk around the reservoir to spot bats swooping and diving as they come to feed.
Paul explains: "Autumn is a great time for bat spotting, as they are very busy feeding, building up fat reserves ahead of their winter hibernation, and young bats are improving their flying and hunting skills.
"Bats are mysterious and often misunderstood animals, we hope people will come along and learn about them. Visitors will be able to use special bat detectors to tune in to the secret calls that bats use to navigate and hunt, and learn how we distinguish between the 18 or so different bat species we have in the UK.
"Please come along with all those unanswered questions about these fascinating mammals, the more challenging the better, and I shall try my best to answer them."
To secure a place email [email protected] Meeting point is at the Earlswood Lakes fishing car park, off Wood Lane, B94 6AD.