The facial stripes are distinct features of a marsh snake. Take care handling him. They are mildly venomous. While considered not dangerous, everyone's reaction is different. Some ppl have experienced serious reactions. I was bitten earlier this year and immediate swelling around the area made my thumb feel that tight I couldn't bend it. By morning half my hand up was like a balloon and pained all over, and around my wrist. These effects lasted a week before it finally subsided.