Which of the following indicates a hawk's comfort level?

The indicator of a hawk's comfort level can indeed be its posture and feather condition. When a hawk holds its head high with fluffed feathers, it usually signifies that the bird is feeling secure and relaxed. A comfortable bird will display an open body language; fluffed feathers can help the hawk regulate its body temperature and indicate a state of ease.

Conversely, a hawk perching on a high branch could demonstrate its confidence or perch preference but doesn't specifically relate to comfort. Moving restlessly while wearing a hood suggests anxiety or discomfort, as the hood can be a source of stress if the bird isn't accustomed to it. Similarly, biting at the training glove typically indicates frustration or irritation rather than comfort. Therefore, holding its head high with fluffed feathers is the most accurate sign of a hawk's comfort level.