What does preening involve?

Preening involves straightening feathers with the beak, which is crucial for maintaining the health and functionality of a bird's plumage. Through preening, birds can remove dirt, parasites, and dust from their feathers, ensuring that they remain clean. Additionally, this behavior allows birds to realign their feathers, which is essential for optimal insulation and aerodynamic properties needed for flight. Properly preened feathers help maintain the structure and effectiveness of a bird's wings, tail, and body feathers, supporting their overall well-being.

Other options reference behaviors that, while important for birds, do not accurately describe preening. Puffing out feathers relates more to birds' displays or adjustments to body temperature. Shaking feathers to dry usually occurs after bathing or when moisture has accumulated. Feeding for digestion is a completely different activity related to nutrition and does not involve feather maintenance.