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"Dave Easterla, left, Distinguished University Professor Emeritus of Biology at Northwest Missouri State University, and Matthew Hill, associate professor of anthropology at Iowa State, with a fossilized complete skull from a sabertooth cat from southwest Iowa," according to the caption on the university press release about the skull. (Image courtesy of Christopher Gannon/Iowa State University)

"Dave Easterla, left, Distinguished University Professor Emeritus of Biology at Northwest Missouri State University, and Matthew Hill, associate professor of anthropology at Iowa State, with a fossilized complete skull from a sabertooth cat from southwest Iowa," according to the caption on the university press release about the skull. (Image courtesy of Christopher Gannon/Iowa State University)

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