Contact: Vince Stricherz
University of Washington
Caption: The teeth of multituberculate mammals evolved from simpler dentition around 150 million years ago (top) to a substantially more complex form by the time dinosaurs died out 66 million years ago (bottom). Blade-like teeth farther forward in the mouth, at right in each image, became continually less prominent in plant eaters.
Credit: Gregory P. Wilson/University of Washington
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