It roosts between the nodes of mature bamboo and enters the stems through holes made by beetles.
BBC: NEWS | Science/Nature | UN alert on threat to wild bamboo
Biologists are worried that Americans' desire for waterfront homes will chase eagles out of the roosts that are vital for their survival.
Bald eagles, for example, will prey on any cranes that are injured or left behind when the roosts fly to the fields for feeding.
Policy-makers in the UK have stepped in to protect bat populations, criminalizing any interference with their roosts, even if no bats are currently present.
"Only about half the bats here regularly use buildings as roosts, although nearly all of them will use them at some stage, " says Gunnell.
Fourteen hours after their initial descent, the two tree-sitters, a male and a female who goes by the name "Olive, " left their tree-top roosts after speaking with Celaya.
West London Mental Health NHS Trust said none of the current bat roosts would be disturbed or destroyed during the hibernation period, which runs from November until March.
As an environmental consultant I am deeply concerned that the lack of a proper planning process will result in direct destruction to important environmental features such as bat roosts, which can often be found in residential properties being extended.
The new, three-hour course, offered by the Royal Institute of British Architects in conjunction with the Bat Conservation Trust, is intended to educate architects about bats, teaching participants the ideal size, access points, temperature, materials and location for bat roosts.
The VWT, an environmental charity with offices in Brecon and Builth Wells, says it will work with the community to develop a "greater understanding of this secretive animal", survey the bat population and improve their travel routes between roosts and woodland.
We are talking about breeding starlings here rather than wintering starlings, many of which are migrants from the North and East and still flock to the South West in huge numbers: as attested to by the spectacular roosts of a million birds or more on the Somerset Levels.
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