The Bonnethead shark is the smallest member of the Hammerhead family, reaching only about four feet in total length. It is found in tropical waters of the Atlantic coast from New England, through the Gulf of Mexico and well into South America. It is also found from the Baja peninsula through the west coast of Mexico and Central America. Bonnethead sharks usually occur in small schools of up to 15 individuals. When migrating, they can be found in schools of hundreds or thousands. Scientists believe that the Bonnethead shark contains a specialized type of cerebrospinal fluid that helps Bonnetheads communicate chemically when another Bonnethead is nearby. They are considered harmless to humans.