Insulated chamber with bat sized cone shaped crevices. A lighter option for accommodating hibernating bats which cn work well within the body of a sheltered woodland where temperatures will be less extreme, or within a loft area. 16mm hole for endoscope inspection in the base facilitating inspection, potentially avoiding working at height with the right equipment. Light internal finish facilitates detection of droppings or rub marks. Top loop makes initial attachment to the tree easier – with two further attachment points for 6” nails for security.