Imagine an animal that looked like a half-finished zebra, its bold stripes simply fading into a solid brown rear, as if a printer ran out of ink. The quagga vanished in plain sight, and the world did not even realize it was gone until years after the last one died alone in an Amsterdam zoo.

This deep dive traces the quagga from the arid Karoo of South Africa through colonial extermination, a bizarre 19th-century genetics debate, and its modern resurrection. Nearly a century after extinction it became the first extinct animal to have its DNA decoded, launching the entire field of ancient DNA and a controversial quest to breed it back.

• The quagga likely lost its hindquarter stripes because its cool, fly-poor Karoo habitat made the stripes' built-in insect repellent function unnecessary.
• Unusually for zebras, quagga mares we ...