+Emerging in the late [Triassic](/wiki/triassic) period, early [mammals](/wiki/mammal) were often tiny, shrew-like creatures that quietly survived in the shadow of dominant reptiles. They developed key features like fur and warm-bloodedness, laying the groundwork for a vast future diversification.
+## See also
+- [Evolution](/wiki/evolution)
+- [Therapsid](/wiki/therapsid)
+- [Mesozoic](/wiki/mesozoic)
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