I used a Bobcat some 16 years ago on the Duke Farms Estate in Somerfield, NJ. They are less general-purpose than a tractor, being primarily loading shovels (we used it to skip around the animal quarters clearing manure, since it turns on a sixpence). A more generic name for this kind of vehicle is skid-steer loader, so called to underline their key feature: their hydrostatic transmission allows you to spin the wheels either side in different directions (like a tracked vehicle can do) so it literally spins on a slick floor within its own length.

On wet brick flooring outside the dairy, we used to turn fancy donuts...!

Here's the real thing ;)

http://telepresence.dmem.strath.ac.uk/jen/lego/skidsteer.htm