Mammals, including humans, stand out with their distinctively upright posture, a key trait that fueled their spectacular evolutionary success. Yet, the earliest known ancestors of modern mammals more ...
Two fossil early synapsids. On the left is a pelycosaur (Ophiacodon FMNHPR454) and on the right is a therapsid (Procynosuchus FMNHPR4974). Disclaimer: AAAS and EurekAlert! are not responsible for the ...
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