The Great Hammerhead ( Sphyrna mokarran ) and Scalloped Hammerhead (Sphyrna lewini) sharks are long lived, late maturing, and relatively slow growing. Great Hammerhead Sharks can live to up to 44 years and have a gestation period of 11 months producing 6-33 pups biennially. Scalloped Hammerhead Sharks can live to up to 35 years and have a gestation period of 8-12 months producing 15-31 pups biennially.