West Caucasian Tur exhibit at Prague, 24/05/10

This run of goat exhibits have a very high number of hardy trees clinging on between the rocks.

What does prevent the animals for escape

There's a bigger gap between the cliff and the fence than it looks like in the photo!

I've head that the "Mountain Ungulates" section of the zoo is spectacular, and besides Barbary apes, Barbary sheep, tahr, ibex, etc, what else is located here?

It is composed of four exhibits:

Himalayan Tahr
West Caucasian Tur
Lammergeier
Barbary Sheep/Barbary Macaque

(there is a separate area nearby for North American ungulates with more caprines - California Bighorn Sheep and Dall's Sheep)

The aviary is pretty standard but the goat/monkey enclosures are spectacular.