This handsome fellow is known as “Lonesome George,” and he is a 200-pound tortoise whose entire species' survival relies upon him mating with a similar species of giant tortoise. George is between 90 and 100 years old and has an expected lifespan of 150 years. Though he hit a “sexual prime” in his early nineties none of the giant tortoise eggs that he fertilized were viable, so for now he is still the world's last example of his breed.(Link | Photo)