Fastest animals Fastest animals This is a list of the fastest animals in the world, grouped by types of animal. The fastest land animal is the cheetah, which has a recorded speed of . The peregrine falcon is the fastest bird and the fastest member of the animal kingdom with a diving speed of . The fastest animal in the sea is the black marlin, which has a recorded speed of . While comparing between various classes of animals, a different unit is used, body length per second for organisms. The fastest organism on earth, relative to body length, is the South
The Planet of Doubt Back on board the "Gaea", Burlingame reveals that shortly after leaving her tether, she ran into a segment-creature which began chasing her. She had the idea of running up to the last creature in the line so that the leader would latch onto it, but inadvertently left herself inside the circle instead of outside. She also deduced that the shapes in the fog were the shadows of flying creatures, and that the segment-creatures were their larvae. "The Planet of Doubt" appears in the following Stanley G. Weinbaum collections: The Planet of Doubt "The Planet of Doubt" is a science fiction