A couple of weeks ago now the world lost Lonesome George, the last remaining Pinta Island tortoise - a sub-species of giant tortoise endemic to that particular island in the Galápagos.
Image: George on 12th August, 1997 - Darwin Station, Galápagos Islands
Until a scientist stumbled across George on Pinta in 1972 it was believed that his particular line was extinct. So, on his discovery he was moved to Darwin Station (where I had the great pleasure of meeting him) in Puerto Ayora in the Galápagos Islands to see out his days under science's watchful eye.
Unfortunately attempts to have him mate with a pair of Espanola tortoises (his nearest genetic match) failed and so the end of the line for George was the end of his line.