New research has uncovered how saber-toothed cats and bear dogs managed to cohabitate peacefully more than nine million years ago. A team of paleontologists from the University of Michigan and the Museo Nacional de Ciencias Naturales in Spain took tooth enamel samples from two species of sabre-toothed cats and one species of bear dog that had been unearthed at sites near Madrid. By analyzing the enamel and determining what the animals ate, the scientists were able to understand how they lived together in a woodland region... By analyzing what they ate, researchers surmised the leopard-sized cats and the bear dogs...