Although much about dolphin communication remains a mystery, scientists have discovered three distinct sounds that dolphins frequently make: chirps, clicks, and whistles. Scientists have learned that dolphins use clicks to create a sonar map, which allows them to navigate and hunt. But apart from possibly transmitting location, the clicks do not appear to serve any communication purpose. Rather, research indicates that dolphins communicate with each other by whistling. This discovery has necessitated further investigation, as scientists are not yet sure whether the whistles comprise a complex system of linguistic communication or a simple set of sonic cues like the ones used by other animal species.

Based on the passage, the most reasonable inference is that

dolphins are not the only animals species that communicates vocally


The final sentence of the passage mentions “sonic cues like the ones used by other animal species,” which suggests that other animals use vocal communication

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