How do rhinoceroses communicate with sounds below the range of human hearing?

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Rhinoceroses communicate using infrasonic frequencies, which are sounds that fall below the threshold of human hearing.1

This method of communication is considered an adaptation that allows these perissodactyls to maintain contact with one another in environments characterized by dense vegetation. Additionally, it is believed that females use these low-frequency sounds to signal to males when they are receptive to breeding.1