What do birds use their tail feathers for?

The story behind the answer

Birds’ tail feathers (rectrices) act like a rudder and elevator, helping them steer, stabilize, and brake in flight. By fanning, tilting, or twisting the tail, a bird changes airflow and lift behind its body to turn, correct wobble, and “flare” for smooth landings. The tail also aids balance during takeoff and while perching or maneuvering through tight spaces.

Context tip: different species tune this tool to their lifestyles—swallows and kestrels use agile tails for sharp turns, while woodpeckers have stiff tails that prop them