I was just recently surprised with a tortoise or American water Turtle for Christmas. My mom said she saved it from the mean Chinese men in Chinatown, California. I researched and the tortoise I have is not a soft shell tortoise that would usually be found in a chinese market for turtle soup. I feel so bad that I don't know what kind he is and how to care for him. My mom says that I can just out him in the backyard and let him hibernate. I have no idea and I don't want him to get sick from the cold weather in Sonoma County, California. Can anyone help me?