Explaining Nature on Instagram: "Animals yawn for many of the same reasons humans do, and watching them do it can be surprisingly expressive. Most yawns are triggered by changes in alertness — a way to stretch the jaw, increase airflow, and briefly boost brain activity. In mammals like lions, dogs, and monkeys, yawning often appears during transitions between rest and wakefulness, and it may even help cool the brain. Some animals also use yawns for communication: for example, a wide, slow yawn i