The last Pinta Island tortoise — believed to be the last of his species. Died in 2012 in the Galapagos despite decades of breeding attempts.
From Wikipedia
Lonesome George was a male Pinta Island tortoise and the last known individual of the subspecies. In his last years, he was known as the rarest creature in the world. George serves as an important symbol for conservation efforts in the Galápagos Islands and throughout the world.