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The Cretaceous Period mammal Spinolestes xenarthrosus is pictured in an artist's rendition in this undated handout image obtained by Reuters October 14, 2015. Scientists on Wednesday announced the discovery near the Spanish town of Cuenca of a stunningly well-preserved fossil of a Spinolestes. It includes a complete skeleton, fur preserved at the cellular level, hedgehog-like spines, plate-like structures of keratin known as dermal scutes, a rounded external ear, skin pores and even soft tissues of the liver and lung. (Photo by Georg Oleschinski/Reuters)
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