These are milk snails! commonly found in Texas, originating from the Mediterranean, and North Africa! They enjoy warm climates, lots of soil to dig in, hiding spots such as logs, rocks, and bark. When too cold, they create a seal and go into a deep sleep! The seal allows their heart rate to decrease and holds a steady temperature to keep from dying. Your snails may benefit from a heating pad! I often use like warm water when spraying their terrarium, and leave them in sunlight, while they will hide from direct sunlight they need the warmth. Hope this helps!