A bird that has a full crop and appears comfortable is likely to:

A bird with a full crop that appears comfortable is likely to rouse, which is a natural behavior in birds indicating that they are settled and content. Rousing involves shaking off feathers, stretching, and preening, typically occurring after a meal when the bird feels safe and relaxed in its environment. This behavior is often seen in well-fed birds that are not experiencing any stress or discomfort, allowing them to engage in normal activities like grooming.

Gorging refers to overeating, which is not the same as simply having a full crop; it implies excessive consumption that can lead to health issues. Hacking is a term used for temporarily keeping a bird outdoors in a safe environment while maintaining the connection between falconer and bird, which does not necessarily correlate with a bird's comfort level or crop condition. Rangle is not a commonly recognized term in falconry, and does not specifically relate to the state of the bird's crop or its comfort. Thus, the behavior of rousing is directly associated with the condition mentioned in the question.