The device USES rollers to clamp onto and move along a line.
Humans turn a screw to make it move along its length, but the weevil's muscles pull along the length of its leg to make it turn.
It's a bit like orangutans do, reaching their arms up to branches to brace themselves as they move along.
Since there is an association between storage system and storage class, objects will move along the designated storage system according to the rule set in migration policy.
The vivid purple spines of this sea urchin from God's Pocket Marine Provincial Park, British Columbia, help it move along the seafloor, as do hydraulically operated tube feet.
As these products move along the supply chain from the farm to the table, they can be contaminated by pathogens such as salmonella, e. coli, and hepatitis a virus.
