Only animal that cannot jump

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Everyone says that the elephant is the only animal/mammal that can't jump. This is NOT true. As far as mammals go, there's sloths, rhinos, hippos, seals, manatees, dugongs, or whales and dolphins (unless you count water as a suitable base for the jump). Heck, I don't even think that a platapus can jump because of the shape of its feet, which leads me to say that ducks and other webed-footed birds cannot jump as well. Other than that, there are many insects that cannot jump like slugs and snails. Some spiders can't jump and niether do cockroaches. However, I do agree that the animal that would recieve the most damage from a jump would be an elephant due to the pressure on its feet.