(n) :
a
tractor crawler, a motorized vehicle that uses
caterpillar tracks instead of
wheels to achieve superior
floatation and
traction. Crawlers are more expensive in
maintenance and harder to operate than wheel tractors, but are often critical for working on soft
soils, transporting great weights, and especially for
bulldozing; a
child who is able to
creep using his hands and knees but is not able to walk