Sharks don't have bones. Instead their internal frames are made of cartilage. Sharks have what some call a sixth sense. They can sense electrical and magnetic fields, which helps them detect prey and orient themselves using the earth's magnetic fields. Sharks' diets vary widely.
Most species grow slowly and mature late.
It can take up to 20 years for some species to reach reproductive age. This means that population depletion can be especially devastating. Dr. Gruber is working to fill in some of the blanks in our knowledge about sharks. I'm going to take you along with me into Doc Gruber's world, where we'll experience these frightening, elegant, puzzling creatures together. Hopefully, by the time we leave, some of us will be able to look a shark in the eye without obsessing on what his teeth might feel like.