What is a giant hood primarily used for in falconry?

A giant hood is used in falconry mainly for two purposes, both of which are captured in the correct choice. Firstly, this type of hood is indeed a box for carrying a hawk, providing a safe and secure environment while transporting the bird, which is essential for preventing injury and reducing stress during travel. Secondly, it can benefit hood-shy hawks, which are birds that may resist wearing traditional hoods. The design of a giant hood can more easily acclimate these birds to hoods in a gradual manner.

This multifaceted utility makes the choice that encompasses both of these functions particularly suitable. The other selections do not fully capture the breadth of the giant hood's uses, as they either limit the application to one specific function or specify usage for only certain types of birds. The comprehensive nature of the correct answer reflects the practicality of the giant hood in falconry practice.