Thresher sharks are found in all temperate and tropical oceans of the world. They grow up to 10 feet (3 meters) long. The common name is derived from a distinctive thresher like tail which can be as long as the body of the shark itself. The teeth of a Thresher, serrated for efficient cutting, rim its cartilaginous jaw. When those in the front drop out or are lost, teeth in the second row move forward into place. The spare teeth, in the second row, are always larger than those in use and in this way keep up with the sharks growth. During a period of 10 years, a shark may produce, use and shed 24,000 teeth. This jaw was about 2 feet (61 cm) wide. This photo was taken in St. Augustine, FL at the Lightner Museum and information next to this exhibit. It is a good zoom. I have not been posting as often because I am so behind on commenting. Thanks for stopping by, taking a look and for all your previous favs and comments. They are very much appreciated. Dana