The Great Hammerhead (IMAGE) Florida Atlantic University Caption The hammerhead sharks in the videos were at least twice the size of the blacktip sharks making them about 12 feet long. They can get as big as 18 feet long. Despite their large size, they are often found in relatively shallow waters that are likely an important area for their feeding. Credit Stephen Kajiura, Ph.D., Florida Atlantic University Usage Restrictions Credit: Stephen Kajiura, Ph.D., Florida Atlantic University License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.