Sea turtles are among Earth’s oldest creatures. Modern day turtles lead a precarious life, only a small percentage making it to old age. They must contend with predators on land and sea, shrinking habitat, thanks to human developments, and avoiding fishing nets at sea, not to mention unpredictable natural disasters such as hurricanes that wipe out nesting sites. The status of sea turtles ranges from vulnerable to critically-endangered, depending on the species. Many governments and non-profit organizations are helping to restore the populations of marine turtles and their habitat around the world, among them the U.S. based Sea Turtle Conservancy and the Earthwatch Institute.