Squamata
The Squamata, which includes lizards and snakes, are the largest group of reptiles. The garter snake belongs to the genus Thamnophis, the most widely-distributed reptile genus in North America.
Source
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"OpenStax College, Reptiles. October 17, 2013."
http://cnx.org/content/m44689/latest/Figure_29_04_09.jpg
OpenStax CNX
CC BY 3.0.
