The creatures are highly active and agile, and usually travel in tremendous, city-block-long leaps through the thin Martian air and also aided by the weak Martian gravity. These leaps end with the long beak buried in the ground, as the secondary function of this beak is to stop the creature. They can leap up the Martian cliffs and across valleys with ease. However, they can also move slowly by walking. Upon seeing Jarvis (the human protagonist), trudge along, Tweel walks beside him.