Quagga

The quagga (/ˈkwɑːxɑː/)^[3] (Equus quagga quagga) is an extinct subspecies of the plains zebra that lived in South Africa until the nineteenth century. It was long thought to be a distinct species, but recent genetic studies have shown it to be the southernmost subspecies of the plains zebra. It is considered particularly close to Burchell's zebra. Its name is derived from its call, which sounds like "kwa-ha-ha".

• http://en.wikipedia.org/wiki/Quagga