Lower jaws of fossil brown bears (IMAGE)

Staatliche Naturwissenschaftliche Sammlungen Bayerns

Lower jaws of fossil brown bears

Caption

Lower jaws of fossil brown bears from the Le Régourdou Cave, Dordogne, France, dating back 243,000 years, and from the Postes Cave, Extremadura, Spain, dating back 71,000–104,000 years. The brown bear from the Postes Cave lived during a warmer interglacial period and had a shorter row of teeth than Ice Age brown bears, as well as a shorter lever arm for its masticatory muscles.

Credit

Mónica Villalba de Alvarado

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License

CC BY-SA

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