Jeff Rotman / Head and gills of juvenile Scalloped hammerhead shark (Sphyrna Lewini), Kane'ohe Bay, Hawaii, Pacific Ocean.

Doug Perrine / Female scalloped hammerhead shark, Sphyrna lewini, off Keauhou, South Kona, Big Island, Hawaii, USA ( Central Pacific Ocean )

Doug Perrine / Female scalloped hammerhead shark, (Sphyrna lewini) off Keauhou, South Kona, Big Island, Hawaii, Central Pacific Ocean

Franco Banfi / Schooling Scalloped hammerhead sharks (Sphyrna lewini) Cocos Island National Park, Costa Rica.

Pascal Kobeh / Scalloped hammerhead (Sphyrna lewini), Cocos Island , Costa Rica. Pacific Ocean.

Michele Westmorland / Large school of scalloped hammerhead sharks (Sphyrna lewini). Galapagos Islands.

Chris Newbert / Scalloped Hammerhead Shark (Sphyrna lewini) school at 60 feet, Galapagos Islands, Ecuador

Norbert Wu / Scalloped Hammerhead Shark (Sphyrna lewini) schooling around a seamount, Cocos Island Costa Rica Pacific Ocean

Tui De Roy / Scalloped Hammerhead Shark (Sphyrna lewini) swimming along deep wall, Wenman Island, Galapagos Islands, Ecuador

Mark Jones / Scalloped Hammerhead Shark (Sphyrna lewini) schooling along deep wall, Wenman Island, Galapagos Islands, Ecuador

Fred Bavendam / Scalloped Hammerhead Shark (Sphyrna lewini) swimming among reef fish Galapagos Islands, Ecuador

Fred Bavendam / Scalloped Hammerhead Shark (Sphyrna lewini) close-up portrait Galapagos Islands, Ecuador, Ecuador