Volcano-eating beavers evolved thicker teeth
The volcanic activity that shaped Yellowstone national park may have sculpted something on a much smaller scale too – the teeth of some rodents. Mountain beavers have teeth with deep crowns, thick enamel and short roots – a condition called hypsodonty, typical of animals that chew gritty, silica-rich grasses. Yet they are partial to soft plants, so why the tough teeth? Image: cliff1066™
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