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Tiny tarsier makes big, ultrasonic noiseJeremy Hancemongabay.com February 13, 2012
The tarsiers communication is "comparable to the highly specialized vocalizations of bats and dolphins, which are used primarily for echolocation," says lead author Nathaniel Dominy with Dartmouth in a press release. He calls the Philippine tarsier's sounds "extreme," and listening to a sample slowed down eight times so we can hear it, one comprehends the adjective.
For a small primate like the tarsier, which is considered a "living fossil" since it is practically unchanged evolutionarily for 45 million years, ultrasonic communication is likely an important tool for avoiding predators. The tarsier is free to communicate without allowing predators to eavesdrop. The ability to hear such levels may also help the tarsiers find insect-prey. In addition,the paper notes the sounds could also be used for alarm calls, rivalry, and social interactions. "Our findings not only verify that tarsiers are sensitive to the ultrasound, but also that [the Philippine tarsier] can send and receive vocal signals in the pure ultrasound," Dominy says. This doesn't mean all other tarsier species communicate via ultrasonic sounds. Other tarsier's calls are audible to humans, although Horsfield's tarsier (Tarsius bancanus), found on Borneo and Sumatra, may be similar to the Philippine tarsier in that it seems to call, but no sounds are heard. Sporting massive eyes, tarsiers are nocturnal and feed on a variety of insects, as well as snakes, birds, and bats.
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