It's alert to anything that flies or moves above the ground level.
It was surprising, too, how well-kept everything was, at least on the ground level.
Its steps were coming upward from the plaza at the ground level.
And suddenly I realized that we were going lower than the ground level.
When Crofton had it there were windows on the ground level and several entrances.
The first thing to do is to make the surface of the ground level.
The car stood at ground level, but the ground was not there any more.
Perches can be almost at ground level or as high as 60 feet.
He was out of the elevator as soon as the door opened at ground level.
I'm still down on the ground level and you are still the evening star!