The term 'Whirlybird Raisers' refers to the people who operate helicopters, which are also known as rotors. Rotors are the blades that spin around the top of a helicopter and provide lift. The job of a Whirlybird Raiser is to maintain and operate the helicopter, ensuring that it is safe and efficient. They must also be knowledgeable about the aircraft's systems and be able to troubleshoot any issues that may arise.