Toothy, Rodent-like Reptile Is Our Ancient Forebear

They’re toothy, furry and tiny, but their existence kicked off an evolutionary success story 240 million years in the making.

Cynodonts are some of the earliest ancestors of mammals, often referred to as ‘mammal-like reptiles.’ They first arose around 260 million years ago, just before the greatest extinction of all time which claimed 95 percent of all life on Earth.

In particular, probainoganthian cynodonts are crucial in guiding our understanding of evolutionary history prior to the

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