This is the Somali Wild Ass - the rarest equine on the planet, with only about 50 animals remaining.  The San Diego Wild Animal Park's small herd may make up 20% of the World's population!  This is one of the only places in the world that you can view this animal.  Notice the zebra stripes on its legs.  It is not actually a member of the zebra species, but related more closely to the domestic donkey.  The San Diego Wild Animal Park has a number of rare equines on display, also including the Onager (another member of the donkey/ass family - pictured on the next page) and only on display at a few places in the entire world.

This is the Grevy's species of zebra, the largest of the zebra species.  You can determine this species from others by it's very thin stripes and extra large ears (typical of any desert living animal).  This zebra also has no stripes on it's belly, which you can see even if he isn't rolling over!  This species of zebra is also endangered. 

Here are a few shots of the Park's herd of Przewalski Horses (Mongolian Wild Horse).  This is arguably the oldest species of horse on Earth, and believed to be the the animal found in cave paintings all around Europe.  It is the only species of horse to never be domesticated and has became extinct in the wild in the past decade.  It has recently been introduced to it's native habitat of Mongolia in special protected preserves, and is doing well with a bright future thanks to breeding programs like those at the San Diego Wild Animal Park.

In the bottom center photo, when you enlarge it you will notice the far right animal has a small white star on it's forhead.  This is not a natural occurence in this species of animal and is argued to be a result of either inbreeding (there were less than 100 horses at one time with which the species has been rebred) or a result of domestication (having not lived in the wild for so long, the species natural need for camoflauge has diminished and white markings therefor begin to appear).