Bats Roosting in my porch: 3. Partial success with lights and CDs

on 6th July 2014

This post follows two earlier ones in my search for a solution to rid my porch of roosting Common Fruit Bats (Cynopterus brachyotis): HERE and HERE (above).

The video clip above shows the bats that arrived after dusk (between 1934-1944 hours) to roost in the porch. There were about seven bats that eventually roosted on the roof – despite the two spotlights that were switched on. Note that at 1.27 minutes, a string of Compact Discs (CDs) were places below, shiny surfaces up. The sudden placing of the CDs caused the roosting bats to immediately fly off one by one. For the next hour or so, a few returned but flew off without roosting. Was it the CDs or the disturbance that caused them to fly off?

The next evening I placed the CDs before the bats arrived. When they flew in they were not disturbed by the presence of the CDs and the spotlights. Waving my hands at them and shouting failed to displace them from the roost. So it was not the disturbance. Was it the CDs then? Note that at 1.29 minutes of the above video, the bats started dispersing. This was in response to one of the two spotlights being directed towards the CDs below. The reflection probably got the bats to leave. At 1.35 minute of the video, the lights were redirected back to the top. And soon, the bats returned but did not roost.

Unfortunately, the bats continued to roost on the roof the following days when the lights were switched on and the CDs placed below. Unless the roosting bats were forced to leaves by other ways they continued to remain on the roof.

The next post will discuss the effects of the spotlights and the CDs on bats that arrived during the early mornings.

YC Wee
June 2014

If you like this post please tap on the Like button at the left bottom of page. Any views and opinions expressed in this article are solely those of the authors/contributors, and are not endorsed by the Lee Kong Chian Natural History Museum (LKCNHM, NUS) or its affiliated institutions. Readers are encouraged to use their discretion before making any decisions or judgements based on the information presented.

YC Wee

Dr Wee played a significant role as a green advocate in Singapore through his extensive involvement in various organizations and committees: as Secretary and Chairman for the Malayan Nature Society (Singapore Branch), and with the Nature Society (Singapore) as founding President (1978-1995). He has also served in the Nature Reserve Board (1987-1989), Nature Reserves Committee (1990-1996), National Council on the Environment/Singapore Environment Council (1992-1996), Work-Group on Nature Conservation (1992) and Inter-Varsity Council on the Environment (1995-1997). He is Patron of the Singapore Gardening Society and was appointed Honorary Museum Associate of the Lee Kong Chian Natural History Museum (LKCNHM) in 2012. In 2005, Dr Wee started the Bird Ecology Study Group. With more than 6,000 entries, the website has become a valuable resource consulted by students, birdwatchers and researchers locally and internationally. The views and opinions expressed in this article are his own, and do not represent those of LKCNHM, the National University of Singapore or its affiliated institutions.

Other posts by YC Wee

8 Responses

  1. Hello YC: Your spotlights & CD-reflected lights are only partial solutions. Total solution calls for rebuilding the sloping porch-roof surfaces so the bats can’t cling on anymore. Mau menang, yah itu nasihat saya, Dong! Old Goblok has spoken!!! Salam.

  2. Mmm… I wonder if YC is planning on using roof reflector sheetings. Perhaps just lining the upper cone area might help if sufficient ventilation is the issue to prevent damp rot.

    Replacing the whole roof… sounds a pretty expensive perfect idea but current timber loft design does look a perfect gallery for hangers’ on!

    Looking out for Part 4.



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