Earth | Nature | Ocean on Instagram: "The true size of a pelican’s mouth is most impressive when the bird yawns or stretches its bill wide open. A pelican’s large, flexible beak-especially the lower pouch, known as the gular pouch-can expand tremendously, revealing just how remarkable this bird’s feeding tool really is. When yawning, the pouch can stretch enough to hold several liters of water or even a large fish, which helps the pelican scoop up prey while fishing. The sight can be both fascin