TOEFL Listening: ETS-TOEFL听力机经 - LX7FI36TBSY64C88P$

What does the professor say about vocal mimicry? A. It is a behavior that is not uncommon in nature. B. Marine organisms have never been observed using it. C. It is a behavior that is genetically determined rather than learned. D. Using it to attract prey instead of to scare predators is unusual.