In George Church's book Regenesis, he recounts the interesting story of resurrecting the Pyrenean Ibex by somatic cell nuclear transfer and surrogate pregnancy in a closely related species. The source article is a great read [0].
The animal that resulted died of lung complications shortly after birth, but apparently veterinarians indicated that these complications were totally within the norm of ibex ontogeny, and probably not a failing of the underlying cell biology.
So, for just a few minutes, an extinct species was brought back to life.