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Mammals are also amniotes , but they differ from reptiles in the structure of their skulls (especially the regions associated with chewing and hearing).
Vertebral counts in modern amniotes , amphibians, and fish, can vary due to environment or change with growth.
The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
The sequence from the early amniotes to the early mammals is the most fully documented of the major transitions in vertebrate evolution.
The oldest known amniotes - close to the ancestry of all reptiles, birds, and mammals - appeared in the early Pennsylvanian, about 310 million years ago.
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