Even if you've never heard of the quagga, you do know of its still-living cousin: the zebra. Quaggas looked similar to zebras, but were brown and had no stripes on the rear half of their bodies, like Mother Nature forgot to finish painting it. Quagga herds used to roam South Africa, but they were hunted to extinction by the late 1880s.
Since then, the quagga has been a primary interest to scientists for de-extinction. A group called the Quagga Project has been working to reintroduce the quagga to South Africa, via selective breeding, where scientists attempt to isolate the dormant genes still present in the zebra, and reintroduce them into successive offspring. The project is already underway, and appears to be working. According to Eric Harley, the project's leader, "We have over the course of 4, 5 generations seen a progressive reduction in striping, and lately an increase in the brown background color showing that our original idea was … correct."
While the newly-introduced animals aren't 100% quagga, they're showing some of the characteristics unique to the animal. They have named the new animals, "Rau Quaggas," after one of the project's originators. In January of 2016, six Rau Quaggas exist, leaving a goal of 50 still a ways off. Once they have enough of the Rau Quaggas to fill a herd, they'll be reintroduced into an animal reserve, and the quagga will once again roam the plains of South Africa.