The Michigan Amphibian & Reptile Sanctuary has a clear mission: Help injured and displaced amphibians and reptiles survive, and return them to the habitats where they belong. That mission was recently on full display in the rescue of "Doug the Tank," a 33-pound common snapping turtle estimated to be around 30 years old, who made it back home after a dangerous ordeal along the shores of Lake Michigan. According to MLive, Doug had reportedly spent…