Describe a job you absolutely would never want to do.
This material can include the fatty tissue, bones, and offal, as well as entire carcasses of animals condemned at slaughterhouses, and those that have died on farms (deadstock), in transit, etc. The most common animal sources are beef, pork, sheep, and poultry.
The rendering process simultaneously dries the material and separates the fat from the bone and protein. A rendering process yields a fat commodity (yellow grease, choice white grease, bleachable fancy tallow, etc.) and a protein meal (meat & bone meal, poultry byproduct meal, etc.).
Rendering plants often also handle other materials, such as slaughterhouse blood, feathers/hair, but do so using processes distinct from true rendering. (Thank you, Wikipedia).