The loneliest animal in the world is George, a 100-year-old Pinta Island tortoise who is thought to be the last of his subspecies. When goats overran their island in the Galápagos, George’s companions died out, and no one has discovered a Pinta female, despite a $10,000 reward. If none is found in time for George to breed, he’ll be the last of his kind.

The second loneliest animal is Khanzir, “the only pig in Afghanistan,” where pork products are illegal. Khanzir, whose name means “pig,” was one of a pair of white pigs that China donated to the Kabul zoo in 2002, but his mate has died.

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03/09/2018 UPDATE: George passed away in 2012, marking the extinction of the Pinta species.