Organisms that are capable of rolling locomotion use different mechanisms to roll without wheels. Some examples include:

Ball-rolling animals: Some animals, such as the pill millipede, roll into a tight ball as a defense mechanism.
Armadillo-like animals: Some animals, such as the armadillo, can roll into a tight ball for protection.
Rolling fish: Some fish, such as the barreleye, can roll their eyes to change the direction of their gaze.
Rolling insects: Some insects, such as the dung beetle, can roll a ball of dung using their legs.
In summary, organisms that are capable of rolling locomotion use a variety of mechanisms such as ball-rolling, armadillo-like rolling, rolling eyes and legs to move without wheels.
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