"I think it is an Eastern garter snake, spotted phase," Lara emailed. "They tend to be brown and splotchy rather than green and striped because they use camouflage rather than speedy escape to avoid predation." Lara added that the snake looks to be pregnant.
Garter snakes give birth to live young -- they are viviparous. Newborns are independent upon birth, having spent two to three months developing during gestation. The Eastern garter snake, Thanophis sirtalis sirtalis, is the most common of the Thamnophis genus.