Mountain Greeches are pasture dwelling animals that roam the bases of mountains. They are able to quickly trot across grass and climb steep mountain paths and other trecherous rocky terrain confidently and with ease, but will only climb so high. Thus they are highly useable as mounts, especially for traversing high peaks where humans are unable to tread.

Their deit consists of grass, but our especially very fond of blue tulips. Even the most ornery and irritable greech can quickly be befriended by feeding it one of these blue tulips. The mere sight causes a greech's eyes to instantly light up, and to bleat with satisfaction after gobbling one down.

The most famous greech, is one by the name of Zeke.

SOURCE(S): Beyond Zork (sample transcript)