Some machines resemble animals in the way they look or the things they do, and so they have animal names. Besides the caterpillar with its crawler treads and the crane with its long neck, here are some others:

ALLIGATOR GRAB—a tool used to pick up things that get dropped into oil well holes.

CAMEL-BACK CRANE—this one has a hump in its boom.

FISHTAIL BIT—a drilling tool which is shaped like a fish’s tail.

KANGAROO PLOW—a plow equipped with strong springs so it can hop over rocks or tree stumps, instead of getting caught on them.

SHEEP’S FOOT TAMPER—a heavy road roller with spikes that pack earth down, the way a flock of sheep does.

WORM LOADER—a long screw that twists round and round to push its load along.