ABSEILING ecologists are using miniature cameras to monitor rare bat colonies roosting inside Blenheim Palace’s Grand Bridge.

The World Heritage Site in Woodstock commissioned the survey work ahead of a multi-million-pound restoration project for the bridge, designed by 18th century architect and playwright John Vanbrugh, which gets under way in 2020.

BSG Ecology’s Guy Miller, a licensed bat ecologist with qualifications in aerial rescue and tree climbing, abseiled down the iconic bridge to identify and inspect features which could support roosting bats and breeding birds.

As part of their survey work BSG Ecology is also using high-specification thermal imaging cameras and bat echolocation detectors.

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The palace’s Historic Buildings and Conservation Surveyor Richard Bowden said: “We knew the bridge was being used by bats during the summer months but we weren’t sure exactly where they were roosting, nor which species they were.”

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All UK bat species, their breeding sites and resting places, are fully protected by law and so it is vital the Blenheim Estate can find out as much as possible about their movements and habits in order to safeguard them.

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Mr Bowden added: “The latest results are extremely informative and we will use them, along with data gathered from previous surveys, to ensure any restoration work carried out on the bridge will not adversely affect the ecology and particularly the bats.

“We will also look at providing additional roosting opportunities within the bridge and the estate in a bid to further secure and hopefully increase wild populations."