The fossil, housed in the San Diego Natural History Museum's paleontology collection, offers a window into what the Earth was like during the Eocene Period, more than 40 million years ago. The specimen includes a lower jaw and well-preserved teeth, giving us new information about the behaviour and evolution of some of the first mammals to have an exclusively meat-based diet. Diegoalerus reconstruction [Credit: San Diego Natural History Museum] "Today, the ability to eat an...


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