Researchers have found that rats are more altruistic than previously thought and will save other members of their species even if doing so is not particularly to its advantage.
For example, if one rat is in danger of drowning, another will extend a helping paw to rescue it. This seemed to be especially true for rats that had experience of a similar dangerous situation themselves, says Nobuya Sato and colleagues of the Kwansei Gakuin University in Japan, published in Springer’s journal Animal Cognition.
Sato’s team conducted three sets of experiments involving a pool of water. Rats dislike being soaked but one swimming in the pool could only gain access to a dry and safe area in the cage if its cagemate opened a door for it.
The team found that rats quickly learned that to help their fellow rat they had to open the door, and they only opened the door when there was actually a distressed cagemate nearby who needed to be saved.
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