Why do elephants flap their ears?

Answer: Cooling blood through ear veins

Cooling blood through ear veins ✓ — Correct! Thermoregulation! Elephant ears: massive surface area with blood vessels. Flapping: (1) Air circulation—cools blood in ear capillaries. (2) Blood returns to body—lowers core temperature. (3) important in hot climates—elephants lack sweat glands. African elephants: larger ears (hotter climate). Asian elephants: smaller ears. Can lower body temp 1-2°C! Also: threat display (ears spread = aggression). Mud baths + ear flapping = cooling strategy. Thermal imaging shows heat loss!

Improving their hearing range — Wrong. Ear flapping doesn't improve hearing—elephants already have excellent hearing. Flapping is specifically for cooling blood through the ear's vascular network.

Creating wind for dust baths — Wrong. Elephants use their trunks for dust baths, not ear flapping. Ear flapping creates airflow specifically to cool the blood in their ear veins.