Birds possess a remarkable array of features adapted for their environment and lifestyle. Three prominent types of features found on a bird's body include:

• Feathers: These are unique to birds and cover most of their body. They provide insulation, enable flight, aid in camouflage, and are used for display during courtship. Different types of feathers, such as contour feathers, down feathers, and flight feathers, serve specific functions.
• Beak (or Bill): A bird's beak is a hard, bony, keratin-covered structure that replaces teeth. Its shape and size are highly varied and adapted to the bird's diet, allowing it to crack seeds, tear flesh, filter water, or probe for insects.
• Wings: These forelimbs are typically adapted for flight, though some birds have vestigial wings or use them for swimming (e.g., penguins). The structure of the wing, including its bone arrangement and feather placement, is crucial for aerodynamic efficiency.