Gerenuks are shy, slight creatures. When threatened or preyed upon, a
gerenuk may stand very still behind a bush or a tree and slowly creep
away with its head lowered, or gallop toward a place of safety.
Although these antelopes are not particularly fast, they are difficult
to chase because they dart in, around, and between the desert bushes
and trees. These photos were taken at the LA Zoo just days ago.

Two adult female Gerenuk stand guard.

Thanks to MickiP65 for the photos via flickr.