While not a roof habitat exactly, Neil Oxley came up with the idea of a man made tree for the city of Leeds to support bats, birds, butterflies, insects and even the much maligned urban fox. Kadas’ research into the potential for green roofs to support rare invertebrates  suggests there is greater potential for green roofs to promote urban habitats.

Restoration ecologist and resource planner Paul Kepart of Rana Creek believes in the near future green roofs will be graded according to a biodiversity index. In keeping with these concerns plant ecologist Christine Thuring emphasises the need for green roofs to form a series of  linked habitats or archipelagos.

It still seems some way off before we start to think of ways of providing green habitats – even roof space – for our larger land based fauna currently being displaced and endangered by urban activity.