Dolphin research. View of a woman communicating with dolphins via hand signals. These are bottle-nosed dolphins (Tursiops truncatus). Extensive testing of dolphins' powers of recognition and problem solving have shown them to be on a comparable intelligence level with the primates. Dolphins continually communicate with each other by a series of clicks and whistles. In captivity they have formed several human sounds, but lack the vocal cords necessary for speech. Whether dolphins actually "speak" to each other is a matter of debate, but they can be trained easily, and readily learn new skills. Hand signals can be used to give commands to trained animals.
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