About us News Bats at Marks Hall Estate Marks Hall Estate is nationally important for bat conservation. Many of the old trees and buildings provide bats with roosting and hibernation sites and the combination of woodland, pasture, lakes and ponds attract a wide variety of insects on which bats prey. The bats here have been encouraged over the last 30 years by a positive approach to woodland management that encourages biodiversity. Marks Hall Estate has worked with the Essex Bat Group, the Forestry Commission and Essex County Council to provide hibernation sites. The old Second World War air raid shelters have been adapted to accommodate bats during hibernation. As a result, Marks Hall Estate is nationally important for hibernating Barbastelle bats and Brown Long Eared bats, and globally important for Natterers bats. More information about the programme to support bats here at Marks Hall Estate can be found on the Campaign for Rural England website.