• Bush Hog is an actual company. “Bush hogging” has become a common term for cutting with a tractor-drive rotary mower. Kind of like calling a tissue a kleenex, which is also a brand name.
• Rotary mower blades are similar to lawn mower blades but since the cutting path is so much wider, an end of each blade is connected to a large disc instead. A lawn mower typically uses one or two large blades that attach in the middle.
• Rotary mower blades are thick and tough. It’s common to accidentally run over rocks, chunks of wood, stumps, etc. Most of the time this doesn’t seriously damage the blades or the mower (though it’s best to not run over those things). Rotary mowers often use shear pins that are designed to break before serious damage happens. Shear pins are cheaper and easier to replace than entire gear boxes. Some mowers use a slip clutch that reduces the chance a sudden blade stop will damage the tractor.
• Although it’s most common to see one behind a tractor, you can purchase versions with an engine that work behind ATVs or UTVs or even self-contained gas powered units.

Common brands include:

• Bush Hog
• John Deere
• King Kutter
• Kubota
• Land Pride
• Woods
• DR Power Equipment (self-contained string trimmer/mower)