What do "shock marks," "fret marks," or "hunger streaks" refer to?

"Shock marks," "fret marks," or "hunger streaks" are terms used to describe distinct markings on a raptor's feathers, particularly notable on the plumage of birds of prey. These markings can occur due to various factors such as environmental conditions, feeding behavior, or stress-related activities that a bird may undergo. They provide visual indicators of the bird's condition, often reflecting its dietary health and activity levels.

Understanding the appearance of these markings can help falconers assess the well-being of the bird and make informed decisions about its care and training. For instance, noticeable hunger streaks may indicate an inadequate diet or stress from hunting experiences. Recognizing and interpreting these features play a critical role in responsible falconry practices and bird management.