OPOSSUMS ARE MARSUPIALS. If you open just about any field guide to North American mammals, the opossum will probably be the very first of the 380 or so mammal species described. That's because opossums are our only marsupial, and marsupials are considered very ancient forms of mammals.
operator - an agent that operates some apparatus or machine; the operator of the switchboard. manipulator. causal agency, causal agent, cause - any entity that produces an effect or is responsible for events or results. company operator - an operator who works for a company. driver - the operator of a motor vehicle.
Owner-operators (also known as O/Os, or doublestuffs) are individuals who own the trucks they drive and can either lease their trucks by contract with a trucking company to haul freight for that company using their own trucks, or they haul loads for a number of companies and are self-employed independent contractors.