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It is [common / commonly] knowledge that we have five senses. Some people believe they [do / have] six senses. They say their sixth sense is the [able / ability] to know something without using [the / an] ordinary five senses of sight, hearing, smell, touch and [taste / tasty] . Scientists have just discovered that some dolphins have seven senses. Researchers in Germany say bottlenose dolphins can sense electricity produced by their [pray / prey] . The dolphins can detect the electric pulses produced [by / at] the heart beats of other sea creatures. This could help dolphins [to / for] find their next meal. Dolphins also use their [excellence / excellent] eyesight and sonar to sense what is around them. This seventh sense may also help them to navigate [using / use] the Earth's magnetic field.

The researchers conducted a study on two dolphins [names / named] Dolly and Donna. Experiments tested what kinds [of / to] electricity the dolphins could detect. Dolly and Donna could sense both [kinds / kind] of electricity - direct current and alternating [currant / current] . They were a lot better at picking [up / on] direct current. All organisms produce direct current electricity in water. The researchers say [being / been] able to detect this means dolphins may be able to sense the [locution / location] of most kinds of fish that are [near / nearly] them. The dolphins could use their seventh sense to hunt, even if they cannot see or hear [well / good] , or if they cannot use their other senses. The study has been published [on / in] the "Journal of Experimental Biology".