Tarsiers , tiny five-inch-long creatures with pointy ears and large, round eyes, listen and communicate using ultrasonic sounds that are outside the range of human hearing. Other primates also use ultrasonic sounds, but tarsiers are the only ones that communicate solely in ultrasound.

Do tarsiers use echolocation?

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. ... The ability to hear such levels may also help the tarsiers find insect-prey.

Can tarsiers hear?

The dominant frequency of the Philippine tarsier's ultrasonic call was 70 kilohertz, amongst the highest recorded for any terrestrial mammal. They can hear up to 91 kHz, well beyond the 20 kHz limit of human hearing.