It fluttered past me like an invisible bird, and the body gave that long harsh breath that is often the very last sound.

There were birds invisible in the rocks around him, making themselves known by small sounds.

Somewhere nearby, an invisible bird began to shriek.

The torrents of invisible birds slowed, but didn't stop.

"I'm feeling a bit frightened too," whispered the invisible bird on my shoulder.

And it seemed that the birds, still invisible to me in the forest, were in waiting on that day.

Faintly at first in one corner, the invisible electronic bird, controlled by Sasha, circles the room.

He saw the treasure within, the invisible bird sighed.

He became an invisible bird, flitting through crevices too narrow for his human form.

An invisible bird warbled an intermittent curtain of sound.