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Bat roost survey

At Applied Ecology we have been busy last summer and autumn undertaking bat activity surveys to reveal how bats are utilising buildings that might be the subject of re-development or demolition planning. Often surveys will reveal the presence of individual bats or small numbers of bats roosting in crevices (like the ones pictured here) but occasionally larger groupings of bats are found. The two videos below were taken this year and show a maternity roost of soprano pipistrelle Pipistrellus pygmaeus bats, and a mating roost of a noctule Nyctalus noctula bat.

Myotis nattererei in roost. Location: London. © Duncan Painter

Natterer’s bat Myotis nattereri in roost.

Soprano pipistrelle in roost. Location: © Duncan Painter

Soprano pipistrelle in roost.

 

 

 

 

 

 

 

 

 

 

 

The first of the two videos shows colony of soprano pipistrelles bats  leaving a relatively newly built house in Gloucestershire – a total of 47 individual bats were counted leaving the roost.

 

 

The second video shows a noctule mating roost in a thatched roof covering a large porch on an historic house in Surrey.  The bats were filmed in September – a time when male bats set-up mating roosts to attract females.  To attract a mate, male noctule bats emit shrill mating calls from the roost entrance or during flights near the roost entrance as well as by releasing a strong odour.  The male bat will defend its roost against other males for a number of weeks. In the video you will see the male bat calling from the roost entrance and leaving and re-entering the roost and his harem of females leaving to feed for the night. Later in the video a brown long-eared bat also leaves the roost to begin its evening activities.