Thousands Of Birds Flocking Hypnotically

Thousands of starlings flying together form an ever-changing cloud against the backdrop of a New Zealand sunset. These massive flocks appear all around the world. Birds generally move in a V-shaped formation because it helps them conserve energy. Since each bird flies in front of the other there is less wind resistance. But, it wouldn't be fair for one bird in the front to get the brunt of the trip so birds periodically switch around creating a hypnotic wave-like motion.