Look for this big beefy shark sitting on the bottom of the exhibit, or cruising through the deep reef. As its name suggests, a sevengill shark has seven pairs of gill slits (most sharks have only five). Its back and sides are reddish brown to silvery gray, or olive-brown and speckled with many small black spots. The shark’s underbelly is cream colored. Other features include a wide head with a blunt nose and only one dorsal (top) fin—most sharks have two.