Sea otters (sea otters) cover the coastal rocks by the archaeological traces.
This observation, according to scientific publication Scientific Reports, has made marine biologists from the international group of scientists led by Natalie Uomini, at the Institute of world history, max Planck Society, reports the Chronicle.info with reference to planet-today.ru.
Scientists found in large coastal rocks traces that sea otters leave when you break the shells of mollusks with the help of small stones that they use as tools.
“If you pay attention to these archaeological traces, it is possible to obtain some idea of the ranges of sea otters. Plus, be made aware of this characteristics of sea otters helpful and in order not to confuse them to leave traces with the traces of ancient people,” says Uomini.
Why scientists call “archaeological” traces left by sea otters? Because, studies show, can be detected even after many years.
Sea otter (Enhydra lutris), despite its name, does not belong to the genus of otters (Lutrа), but still are their biological relatives, and otters, and sea otters belong to the family Mustelidae.
Three hundred years ago the world had about three hundred thousand sea otters, however, by the early twentieth century these animals only a few thousand sea otters were almost exterminated for their valuable fur. Sea otter, as scholars have noted, are the only species of marine mammals, whose members know how to use stones as tools.