Many animals, including the elephant, opossum, hippopotamus and numerous others, can't jump. It is a myth that only one species in the entire animal kingdom is incapable of jumping.
Other land animals that can't jump include sloths, rhinoceroses and ticks. There are a variety of sea creatures as well. An animal's ability to jump is dependent on his physiology and genetics. Sloths, for example, lead a lethargic life high in the trees away from predators. Jumping is typically a learned behavior acquired through experience and reflexes; but if the animal is physiologically incapable of jumping, no amount of training or intervention can help him jump.