Concept
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Evolution of Mammals
![Cynodonts](../../../../../../../../../figures.boundless-cdn.com/19353/full/figure-29-06-02.jpeg)
Cynodonts
Cynodonts, which first appeared in the Late Permian period 260 million years ago, are thought to be the ancestors of modern mammals.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Mammals. October 17, 2013."
http://cnx.org/content/m44692/latest/Figure_29_06_02.jpg
OpenStax CNX
CC BY 3.0.