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A study of retrovirus and mitochondrial DNA suggests that C. didactylus and C. hoffmani diverged 6 to 7 million years ago. Furthermore, based on cytochrome c oxidase subunit I sequences, a similar divergence date ( years ago) between the two populations of C. hofmanni separated by the Andes has been reported. Their ancestors evolved with marine vertebrae, the three toed-sloth

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