What is quill feather?

A quill feather is a type of feather that is commonly found on the wings of birds. It is characterized by a long, stiff shaft or spine that is called the quill or the calamus. The quill is made of a hollow, lightweight material called keratin, which makes it strong and flexible.

The quill feather has a number of important functions for birds. It provides lift and stability during flight, helps to regulate body temperature, and can be used for display and courtship rituals. Quill feathers also play a crucial role in insulation and waterproofing, helping birds to stay warm and dry in wet or cold weather.

Quill feathers come in many different shapes and sizes depending on the species of bird. They can be long and slender, rounded and compact, or even curved and serrated. Some quill feathers, such as those found on eagles and other birds of prey, are highly specialized for capturing and gripping prey.

Overall, quill feathers are a remarkable adaptation that allows birds to navigate and survive in their environment with great precision and skill.