The impression left after watching the motions of birds is that of extreme mobility-a life of perpetual impulse checked only by fear.
"Wild Life in a Southern County"
Richard Jefferies
But what is so obviously true of water is scarcely less true of air and fire; and it appeared at length that only a substance possessing the most general characters of body, such as shape, size, and mobility, could be thought as truly primeval and universal.
"The Approach to Philosophy"
Ralph Barton Perry
It was not a living face, but a mask of frightful mobility.
"Edge of the Jungle"
William Beebe