1.   Just because dolphins use language in a different way does not mean that they lack high intelligence or can not communicate.

2.   Observations of Freddy led them to conclude that dolphins use sonar while hunting.

3.   An exhibit on echolocation shows how dolphins use sound to navigate.

4.   Adult dolphins also use whistles to communicate with each other.

5.   Q. How do dolphins use sound to communicate?

6.   They contend that the noise drowns out the high-frequency sounds that dolphins use to communicate with one another and to find food.

7.   Whales keep in touch over very long distances using low-frequency sound waves, while dolphins use higher-frequency sounds.

8.   Dolphins also use sonar, and some have been trained by the Navy to help find mines.