The tarsier - a shy, wide-eyed nocturnal species from the Philippines - is the first primate to be identified as having the ability to communicate in purely ultrasonic frequencies.
A new study published in Biology Letters today has revealed that the endangered Philippine tarsier (Tarsius syrichta) communicates using sound with a frequency greater than 20 kilohertz. The finding contradicts conventional thinking that all primate vocaliations are audible to humans.
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Image credit: David Haring
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