Manta Ray

Manta ray (Bob Owen / CC BY)

Manta rays (Manta sp.) are large eagle rays with triangular pectoral fins and long head fins. Manta birostris reaches a width of 7 meters (23 feet). Mantas have the largest brain–to–body mass ratio of all sharks and rays. They do not carry a sting and are not dangerous to divers.

More images » More info »

This supplemental online resource accompanies the book Scuba Diving Hand Signals by Lars Behnke, available on Amazon.