Common Garter Snake
This snake has a pattern of yellow stripes on a brownish green background. This one was about 35 cm long. I found it with just its head sticking out of the leaf litter in a deciduous forest. I sat on the ground right next to it, but it did not slither away and was perhaps a bit overconfident in it's camouflage.
The Common Garter Snake is a snake indigenous to North America. Most garter snakes have a pattern of yellow stripes on a brown or green background and their average length is about 50 cm, maximum about 125 cm .