What does 'beam feathers' refer to?

'Beam feathers' specifically refers to the long feathers found on a hawk's wing. These feathers are crucial for a hawk's ability to maneuver and control flight. They provide the necessary lift and help in steering during aerial pursuits or when navigating through the trees and other environments. Understanding the function and placement of beam feathers is essential for anyone looking to train and handle birds of prey, as they play a significant role in the bird's flight dynamics and overall health.

The other options refer to different parts or types of feathers that do not correctly match the definition of beam feathers.