Approximately 66% of a great white sharks brain is dedicated to its sense of smell, being able to smell 1 part per 1,000,000,000 (1 billion) of blood within the water. Great white sharks have their maximum width within 33% of their total length, a width which is nearly 25% of the total length of the body. This tapered shape minimizes drag and allows a shark to move quickly and freely, an ideal which has been shaped by evolution