In the Amazon River lives one of the largest freshwater fish on Earth—the arapaima. This huge river hunter can grow up to 10 feet long and weigh 400 pounds. In its watery home, the arapaima is an apex predator. It hunts for fish and birds, but none of its animal neighbors are large enough or powerful enough to catch this giant fish! Filled with information perfectly suited to the abilities and interests of its primary grade audience, this colorful, fact-filled book gives readers a chance to learn about the lives of apex predators. The book will also help readers develop their powers of observation and challenge them with activities and critical-thinking questions about the arapaima's physical characteristics, its everyday life, and its hunting abilities.