Contourfjær

Contourfjær, often translated as contour feathers, are a type of bird feather. They are the most common type of feather and cover the body of a bird, forming its outer contour. These feathers are crucial for a bird's ability to fly, providing the aerodynamic surface of the wings and tail. Their structure is characterized by a central shaft, the rachis, from which barbules branch out. These barbules interlock to create a strong yet flexible vane.

Contour feathers also play a significant role in thermoregulation, trapping air close to the body to insulate against cold. They contribute to a bird's coloration and patterns, which are important for camouflage, species recognition, and courtship displays. The arrangement and type of contour feathers can vary greatly between different bird species, reflecting adaptations to diverse environments and lifestyles. For example, flightless birds have modified contour feathers that do not form a cohesive vane. The smooth, streamlined surface created by contour feathers is essential for efficient movement through air or water.