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The rafters of Woodchester mansion are home to a colony of greater horseshoe bats. The big, open space in the abandoned mansion is a perfect hideaway for these bats: cool, quiet and out of the way.

During the night, these nocturnal mammals are out in the surrounding woodland, voraciously feeding up on beetles, moths and flies in preparation for their forthcoming hibernation. The greater horseshoe is , and the Autumnwatch team had to apply for a licence to approach and film the roost.

October is the month which sees . Following insemination, a vaginal plug forms inside the female storing the sperm until fertilisation occurs in the spring. In a matter of weeks, the whole colony will leave the mansion for their winter roosts, where they'll hibernate through the cold months.

Unlike the fluctuating conditions inside Woodchester mansion, the location the greater horseshoes select for the winter (tree hollows or caves) will be regular in temperature and humidity, allowing these small mammals to hibernate undisturbed. The bats are loyal to their roosts and will return to the same location year after year.

Woodchester is also home to the greater horseshoe's cousin, the lesser horseshoe. As the name suggests, the main difference between the two species is their size. Greater horseshoe bats are the size of a pear, whereas the lesser horseshoes are more like the size of a plum.

These are Britain's only bats to have a horseshoe-shaped fleshy structure called a nose-leaf surrounding the nose, which amplifies the ultrasonic calls that the bat emits when searching for food. in that all of Britain's other bats echolocate using their mouths alone.

If you would like to know more about the species of bats in your area and would like to get involved in their conservation then contact the who will be able to put you in touch with your local bat group. There are over one hundred throughout the UK. Martin has blogged about getting more involved with bats.

The Autumnwatch team also struck upon a row of in the fields surrounding the mansion. The badgers use their faeces to mark their territorial boundaries, giving notice of occupation to other potential badger intruders. Researchers at Woodchester bait badger food with harmless, coloured plastic discs and record where they are distributed to in an attempt to determine the different badger clan territories around the park.

(Â鶹Éç Gloucestershire have made a . The visit even made .)

So armed with all this infomation about wildlife that goes bump in the night, get into the Halloween mood by taking a night time woodland walk. Listen out for the sounds of surrounding wildlife: the eerie from the tree tops, in the distance, deer rustling close by in the undergrowth and, of course, the unmistakeable whoosh of bats as they fly past your ear...

(Chris Packham has created a downloadable guide to sounds of the night for Â鶹Éç Breathing Places.)