Animal communication is an open secret. They are sending signals out in the open but we have no way of comprehending these signs that are all around us. For decades scientists watched these 15 cm long primates. Occasionally the animal would open and close its mouth but no audible sound came out. Perhaps, it was speculated, they were cooling themselves off somehow. Then in the last decade, field recordings showed that "these tiny primates can send and receive ultrasonic calls, joining a select club of mammals with the same acoustic talent—namely, whales, dolphins, cats, rats and bats. Researchers already knew that tarsiers make at least 15 distinct calls—all of which are audible to people—but until now no one had good evidence that they also communicate with ultrasonic shrieks"
More on ultrasonic Tarsier
https://www.youtube.com/watch?v=8rBndmo8DKA
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