Stock Photo - The skull of a spotted hyena, a striped hyena, a tiger, a lion, a brown bear, and and ice bear (from the top) at the preview for the special show ""Climate forces - leading power of the evolution"" at the state museum for prehistory in Halle/Saale, Germany, 29 November 2017. The exhibition is opening starting 30 November. The focus of the show is to point out how the change in warm and cold temperatures in the past 2.7 million years led to the development of various life forms. Photo: Hendrik Schmidt/dpa-Zentralbild/dpa. - Halle (Saale)/Saxony-Anhalt/Germany

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