Sharks. Mysterious, dangerous, and often feared, these predators of the sea are fascinating creatures that capture the interest of all ages. Each shark species is unique, with adaptations that help it survive in its own part of the ocean. Become an armchair marine biologist! This photo-illustrated book describes the vicious bull shark. Explains their life cycle, how they hunt prey, and the danger they can be to ocean and river swimmers. Includes information on work being done to protect this shark from overfishing.