and how does it communicate?
Through six different calls.
Plains zebra
At least six different calls have been documented for the plains zebra. 
what is quagga? A subspecies of the plains zebra. where is it found? In South Africa. is it a surviving or extinct animal? It is now extinct. is any effort taken to bring it back by any chance? Yes, the Quagga Project. when was it started? In 1987. whose initiative was it? Reinhold Rau. who is this person? UNANSWERABLE which milestone did the project achieve? The Project's first foal was born on 9 December 1988. On 20 January 2005, Henry (a foal considered to be the first quagga-like individual because of a visible reduced striping) was born. The first 5th generation foal was born in December 2013. the kind of zebra that you mentioned in your answer, how does it look? The species is intermediate in size between the larger Grévy's zebra and the smaller mountain zebra. It is dumpy bodied with relatively short legs and a skull with a convex forehead and a somewhat concave nose profile.
wiki:11720614
Plains zebra [SEP] Communication
At least six different calls have been documented for the plains zebra. One of which is its distinctive, high-pitched, contact call (commonly called "barking") heard as "a-"ha", a-"ha", a-"ha"" or "kwa-ha, kaw-ha, ha, ha" also transcribed as "kwahaah", or "oug-ga". The species name "quagga" is derived from the Khoikhoi word for "zebra" and is onomatopoeic for its call. When a predator is sighted, a zebra makes a two-syllable alarm call. A loud snort is made when moving in cover of potential danger. When in contentment, a zebra makes a more drawn-out snort. Males make a short, high-pitched squeal when hurt, and foals emit a drawn-out wail when in distress.