What kind of feather helps birds maintain their body temperature?

What kind of feather helps birds maintain their body temperature?

• A. Flight feathers
• B. Down feathers
• C. Contour feathers
• D. Filoplumes

Answer: (B)

Down feathers play a crucial role in helping birds maintain their body temperature. These feathers are characterized by their soft and fluffy structure, which traps air close to the bird's body. This trapped air serves as an insulative layer, reducing heat loss in colder environments and keeping the bird warm. Down feathers provide an excellent thermal barrier, which is especially vital for small birds that can lose body heat quickly.

Other feather types serve different functions: flight feathers are long and stiff, designed for aerial movement; contour feathers cover the body and offer protection while also aiding in streamlining; and filoplumes are delicate and hair-like, primarily serving a sensory function rather than providing insulation. This distinction clarifies why down feathers are specifically suited for temperature regulation compared to the functions of the other feather types.