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" ... Another indication that the spread of grasslands influenced canid evolution is their tooth structure. Tseng explains what measuring the durability of canid teeth can tell paleontologists about their dietary habits: “We measured tooth durability by shooting light through fossil teeth and categorizing different patterns of the enamel covering on teeth. This is important because we know that teeth with criss-crossing enamel are stronger and more resistant to cracks, and are more suitable for eating hard foods and resisting inadvertently ingested grit.” The fact that the teeth became more durable around the same time further implicates the rise of grasses as an evolutionary pressure on canid morphology. ... "