The hippo. A territorial beast that spends most of its time in water. An aquatic mammal that can't swim. A two-tonne hulk that can sprint faster than a human. And a seemingly placid oaf that guards its family with fierce cunning. Using specialist camera technology to get up close and personal with hippos for the very first time, this film follows these animals through the seasons in the Okavango Delta. It reveals that while hippos may be boisterous, aggressive and bold, they are also sensitive, sociable and often comical. An intimate, immersive portrayal revealing a side of hippos never seen - or heard - before.