Their surface is bare, and anything moving on them might become visible to a watchful eye, notwithstanding the dimness of the moonlight.
Tyope lay down, and began to glide like a snake.

He moved slowly, pushing his body into every depression, hugging closely every protuberance.

Thus he succeeded in crossing the open space between the woods and the rim of the declivity.

Now he could overlook the valley beneath and glance down the slope.

It was not very steep, and thickets covered it in places.