Let's be obvious - a battery of bats. When I was in Philippines, our unit was quartered in a
tower on top of the huge University of Santo Tomas building. Many minor eaarthquakes had made
cracks in the cement of the building, and though these were quite narrow, they were
shelter to thousands of bats, which would emerge at twilight. I have never heard of anything
like it in the US. I was glad to see them, because there were billions of mosquitoes as result of
the Japanese sabotage of the sewerage system. They bred in puddles everywhere. The
corpsmen in hospital beneath us when on duty at night amused themselves by trying with brooms to
knock down bats flying in the corridors, which should have been forbidden since they were
catching mosquitoes that might have transmitted malaria to patients.