What is bristles feathers?

Bristle feathers are specialized feathers found primarily in birds, characterized by their stiff, hair-like structure. They are typically located around the beak, eyes, or other sensitive areas and serve important functions such as sensory perception and protection. Unlike typical contour feathers, bristle feathers lack the interlocking barbules that give feathers their typical flat shape, allowing them to remain more rigid and act as tactile sensors.