The hammerhead shark is named for the flat, laterally extended shape of its head, called a “cephalofoil.” The cephalofoil allows the hammerhead shark to see above and below at all times, giving the shark a 360 degree view of the vertical plane in front of it. Hammerhead sharks are one of the few types of shark that swim in schools, sometimes in groups of hundreds of sharks. Hammerheads leave their schools in the evening and spend their nights hunting in solitude. There are nine species of hammerheads, which range in length from three to twenty feet long, and weigh between seven and 1,300 pounds. Sharks are common imagery in traditional american tattooing, and make for a great classic tattoo. I would love to do more tattoos like this!