Bull sharks , Carcharhinus leucas , with teeth resembling the great white's, cruise along the continental shelves to eat almost anything but prefer feeding in shallow tropical waters. This grey shark with an off-white underside has a wide, blunt heard. The bull shark is unique among shark species for its adaptability to freshwater. These sharks inhabit Lake Nicaragua and have been found 2,000 miles inland in freshwater rivers. The blue shark , Prionace glauca , has extremely long pectoral fins and a long pointed snout.
Blues are brilliant dark blue with white undersides.
They are found worldwide in tropical and temperate seas, often on the surface of deep water. Blues are among the most traveled species of shark. This species wanders throughout the North Atlantic Ocean. They sometimes travel in groups and have been observed rounding up schools of fish for prey. Hammerhead sharks can be recognized by their flattened, rectangular-shaped heads suggesting a hammer.