What is the bloom in the context of hawks?

In the context of hawks, "bloom" refers to a mantle of gray sheen on the feathers. This phenomenon is particularly observed in certain species of raptors, where the sheen can enhance their physical appearance and is often influenced by the structure of the feathers as well as the angle at which light hits them. The bloom can serve as a form of display, but it primarily refers to the aesthetic quality of the feathers, which can also play a role in camouflage and the bird's overall health. Understanding the characteristics of raptor feathers, including bloom, is crucial for falconers as it can indicate the condition of the bird and its suitability for hunting or exhibition.