Cats are known for their agility and grace, but have you ever seen a group of cats move in perfect synchronization? Cats in sync refers to a group of cats moving together in a coordinated and synchronized way, often moving their heads in sync after a toy, a fly or some other prey. This behavior is not limited to feral cat colonies and is often seen in domestic cats. Cats in Sync is both mesmerizing and entertaining, as the cats move together in a seemingly effortless and graceful way, this phenomenon has spawned many memes all over internet. It's a testament to the intelligence and adaptability of these amazing animals. An animal custom progress bar for YouTube with Cats in Sync.