Marine species guide
Hammerhead shark
Hammerheads are instantly recognised by the hammer-shaped head (cephalofoil). Divers meet them on seamounts, channels and seasonal aggregation sites—usually as passing pelagic encounters rather than reef residents.
Identification features
The wide cephalofoil with eyes at the tips is diagnostic. Species differ in head shape and size: scalloped hammerheads often school; great hammerheads are solitary and larger.
- Hammer-shaped cephalofoil
- Tall first dorsal fin
- May school or cruise alone by species
- Pelagic and seamount habitats
Habitat and behaviour
Grey-brown dorsal colouring, tall first dorsal fin, and crescent tail. Never approach from above in a way that corners the animal against reef or boat.
Where and when to see them
Lookalikes among sharks lack the hammer; confirmation is usually immediate once the head is visible.
Dive tips
Lookalikes among sharks lack the hammer; confirmation is usually immediate once the head is visible.
Frequently asked questions
How do I confirm the ID?
Combine visible traits with location and depth, then compare photos in Scuba Steve’s fish identification app and regional guides.
Should I touch it?
No. Maintain neutral buoyancy and a respectful distance for safety and animal welfare.
Where can I learn more?
See related dive-site guides on Scuba Steve and ask local operators about recent conditions.