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The hypothesis that mothers prefer to keep the offspring on the left was confirmed for walruses

Biologists at the St. Petersburg State University confirmed in case of walruses and flying foxes that the habit of mothers to keep the baby on the left side of themselves is widespread in wildlife and is typical for many mammals.
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The tendency to hold the baby on the left hand has long been known as a women’s particularity. It was believed previously that this is a social phenomenon, then there appeared data on a similar feature of our closest relatives from the hominid family — gorillas and chimpanzees.

St. Petersburg biologists showed in a previous study that offspring of mammals, who rarely use limbs to interact with them (horses and cetaceans), prefer to look at their mothers with their left eye. In the new work, scientists, using the example of Pacific walruses and Indian flying foxes, tried to find out how other mammals use the forelimbs to interact with the calves.

The preference for looking at the mother with the left eye, it turned out, is a common characteristic feature of such distant species of mammals. The right cerebral hemisphere of the young, which processes information from the left eye and recognizes important images, dominates the processing of information about the mother, the authors say.

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