A Radio Talk by Charles F. Kettering I was discussing this with a musical friend of mine and I asked him if he knew of this peculiarity. He said he had never heard of it but he was very curious to know why the bat had this high pitched voice and how he used it. So - I told him of the work that had been done by two professors at Harvard and added that there were other animals such as cats and dogs who, in addition to their audible voices, were able to communicate with each other in inaudible sounds. Now most people regard the bat as a rather objectionable, somewhat loathe some creature that lives in dark caves and comes out only in the evening and flies around to hunt for food. The thing that makes this more interesting is that tests made in many of the caves where the bats live show that there is insufficient light to register on our most delicate apparatus. These devices can detect light much below the point of visibility. Now the bat can fly around in these caves apparently as well as if they were fully lighted. |