| The bone to the left shows rodents gnawed marks left on the bones surface.
The La Brea website notes:
"Commonly called the "tar pits," the liquids that seep out of the ground at Rancho La Brea are actually comprised of asphalt, not tar. Tar is a commercial by-product made by the distillation of woody materials, such as coal or peat, while asphalt is a naturally formed substance comprised of hydrocarbon molecules."
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