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| In the wild, it is difficult to study sharks because they constantly move around, swim too fast and dive too deep for divers to keep up with them. Some sharks, like hammerheads, are even scared away by bubbles produced by scuba divers. To follow sharks, scientists catch them and attach sonic tags to their fins. When the sharks are released, scientists can keep track of them by picking up radio signals with a receiver. Great care is taken to keep sharks alive, when they are caught for tagging and other studies. Also, certain types of shark are placed in aquariums where they can be easily observed. |