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In their paper, which was published in the journal Archaeological and Anthropological Sciences, researchers wrote: "The pebble from San Lázaro rock-shelter presents a series of characteristics that render it exceptional, based on which we have deemed it a visual symbol that could be considered a piece of portable art in some contexts."

The new work by Hardy and his colleagues “supports the idea that microscopic residues of strings are preserved in nonwaterlogged rock-shelter deposits of Neandertal age,” Soressi observes.

Almost all the teeth, including the oldest ones from about 20,000 years ago found at the Batadomba-lena rock-shelter in southwestern Sri Lanka, indicated a diet primarily of food from the rainforest.

Only one race, however, that named after the rock-shelter of Crô-Magnon in the Dordogne, is represented by a fair number of specimens, namely, about a dozen.

The disappearance of the herds caused Fleetfoot and Willow-grouse to leave the rock-shelter.