Scientists: The longest memory is not in elephants and dolphins have
It is believed that of all the members of the animal world's most elephants have a good memory, but the researchers say, is the longest in the memory of reality in other animals - the dolphins. U.S. scientists say some dolphins can distinguish and remember each other even after 20 years. The study's authors say that such a long memory - this is one aspect of a complex system of social relations present in the dolphin society. The study, published in the latest issue of the scientific journal Proceedings of the Royal Society B, said that researchers have found how the Dolphins use the information in memory.
In the experiment, experts selected the 56 bottlenose dolphins that were divided into six different zoos and aquariums in the United States and Bermuda. Studies have shown that even after two decades at the reunion Dolphins could keep the system of social and family relationships. In other words, even after 20 years of dolphins could distinguish "us" from "them." In addition, the dolphins can remember each other's voice, and when researchers in underwater speakers broadcast the voice of dolphins, "relatives" guinea Dolphins react to them accordingly. "When the Dolphins have heard the" native "voice, they swam very close to the speakers and detained them for a long time.
They listened when the speaker came from a "foreign" voice, but did not show the same reaction, "- said James Brooke, a biologist at the University of Chicago in the United States. "It's unprecedented data storage dolphin, which is longer than the memory of elephants "- says Brooke. According to him, in one experiment, they tested the two female dolphins who as a child lived together, and then were divided into different aquariums. As it turned out, the dolphins remember each other's voice, even after 20.5 years. The researchers say that the dolphins, as it turns out is not only very long but also very accurate memory as dolphin voices are almost indistinguishable difference in tone.
"In these oceans Dolphins hold their families, and their group have a complex social structure, where there are leaders and those who protect others. At the same time, the Dolphins can go from one group to another, but they always remember the representatives of the former groups, "- says Brooke.
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