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.
What is an Operator? Once upon a time you had to be a member of one of two units in US Special Operations to be considered an operator. Those units were SEAL Team Six and Delta Force and only those who passed selection and training were entitled to call themselves that, not support personnel or those on the periphery. Today everyone is an Operator.