If a bird is comfortable in its environment and has a full crop, it is likely to:

When a bird is comfortable in its environment and has a full crop, it is likely to rouse. Rousing is a behavior exhibited by birds where they fluff up their feathers, often as a way to rearrange their plumage for insulation and comfort. This action generally indicates that a bird feels safe and settled in its surroundings, as it can relax and express this behavior without the stressors that could provoke defensive or aggressive actions.

In contrast, gorging refers to overeating, which generally occurs when a bird is actively hunting or in a competitive feeding environment, not when it is merely comfortable. Hacking involves the practice of keeping a bird in a familiar environment, but it is not directly linked to the state of being relaxed and comfortable with a full crop. Rangle is not a standard term associated with falconry or bird behavior. Therefore, rouse accurately reflects the behavior of a bird that is at ease and well-fed, illustrating its comfort in the environment.