Diving in San Benedicto Island (Revillagigedo)

Great Hammerhead

General species description, not specific to this destination

The Great Hammerhead is the largest of all hammerhead species, instantly recognizable by its massive, flattened head extension called a cephalofoil. This prehistoric-looking predator can reach lengths of up to 20 feet, with a distinctive tall, sickle-shaped dorsal fin. Their unique head shape houses electroreceptors that help them hunt stingrays buried in sand. Great Hammerheads are solitary hunters, often seen cruising along reef walls and sandy bottoms. Despite their intimidating size, they're generally shy around divers and will often move away when approached. Their powerful swimming style and graceful movements make encounters truly memorable for fortunate divers.

Spotted Eagle Ray

Destination note

Occasional sightings at El Canyon and Roca Partida cleaning stations. More frequent March–May.

Hawksbill Turtle

Destination note

Year-round resident during dive season. Frequently sighted at cleaning stations at El Boiler and El Canyon.

Green Sea Turtle

Destination note

Uncommon but regular. Most often seen grazing on shallow volcanic reef slopes.

Atlantic Bottlenose Dolphin

Destination note

Frequently sighted at all dive sites, especially San Benedicto and Socorro. Known for extraordinarily interactive behavior with divers.

Townsend's Shearwater

General species description, not specific to this destination

A critically endangered seabird endemic to the Revillagigedo Archipelago. Nests in burrows on Socorro and Clarion Islands, foraging over deep oceanic waters for fish and squid.

Longspined Porcupinefish

General species description, not specific to this destination

The Longspined Porcupinefish is a fascinating resident of tropical reefs around the world, easily recognized by its rounded body covered in prominent spines and distinctive yellow-brown coloration with darker spots. When relaxed, this gentle fish appears almost balloon-like as it slowly navigates the reef. However, when threatened, it transforms dramatically by inflating into a spiky sphere twice its normal size - a spectacular defensive display that divers occasionally witness. These curious fish often approach divers closely, their large eyes giving them an almost comical expression. They're commonly found hovering near coral formations and caves during the day, using their beak-like mouths to crush small crustaceans and mollusks. Their slow, deliberate swimming style and tendency to remain stationary make them excellent photography subjects for underwater enthusiasts.

Great Barracuda

Destination note

Year-round resident during dive season. Frequently seen at El Boiler and El Canyon. Often solitary or in small groups.

Telja's Nudibranch

General species description, not specific to this destination

A colorful aeolid nudibranch with elongated cerata covering its back. Found on rocky reefs feeding on hydroids. Displays striking orange and white coloration.

Socorro Serrano

General species description, not specific to this destination

A small reef fish endemic to the Revillagigedo Archipelago. Occurs on rocky reefs and boulder slopes where it hunts small crustaceans and fish. Distinguished by its mottled brown and white pattern.

Finespotted Moray

General species description, not specific to this destination

A large pale moray finely speckled with dark spots that lurks in reef crevices and ambushes fishes and octopuses at night. It is widespread in the Eastern Pacific including the Galápagos.

Jewel Moray

General species description, not specific to this destination

A small reddish-brown moray patterned with pale jewel-like spots ringed in dark, hiding in crevices on rocky reefs. It ranges through the Eastern Pacific including the Galápagos.