Get to Know the Smartest Fish in the Sea


Order: Rajiformes

Family: Mobulidae

Genus: Mobula

Species: M. birostris

Range: Warmer waters of the Pacific, Indian, and Atlantic oceans, typically in shallow waters—where food is abundant—but also in the open ocean

Population: Worldwide population is unknown; subpopulations estimated between 100 to 1,000

How to spot them: Kite-shaped bodies typically dark on top and white with dark spots underneath; large, elongated pectoral fins

IUCN Red List Status: Vulnerable—at high risk of extinction in the wild

With wingspans easily reaching more than 20 feet (up to 30 in rare cases), the gentle, giant manta ray is one of the ocean’s largest fish—and the smartest. These huge creatures have brains to match their size, with the biggest brain-to-body ratio of any fish. Believed to be highly intelligent, mantas have been known to display curiosity toward divers and attempt to interact with them. Studies show they may even be able to recognize themselves in a mirror—something very few species can do—and create mental maps of their surroundings.


These graceful and efficient swimmers (they move around 9 miles per hour and can reach bursts of 22 mph) could easily migrate vast distances across the open ocean, but recent research has found that they often travel just a few hundred miles, remaining within specific subpopulations in regions like the South Pacific, Ecuador, and Bali. Rather than relocate long distances to follow a food source, the way most large ocean creatures do, giant mantas stay put and adjust their meals to what’s around them—zooplankton, large shrimp, even small fish. Their habitat and feeding grounds often overlap with that of their smaller relative: the more coastal reef manta ray, M. alfredi, whose wingspan reaches up to 18 feet.


Because these elusive fish are so difficult to study, scientists are still working to correctly classify them. Reef and giant mantas became separate species in 2009, and in 2017, DNA studies revealed they both belonged to the genus Mobula—and not in the separate genus Manta. As science advances, we’re sure to learn even more.


Scroll for more facts about this fascinating fish.


manta ray underwater manta ray belly

One of a Kind

The dark spots on a manta ray’s white belly are unique to that individual—kind of like fingerprints. This helps researchers and citizen scientists alike identify and track individuals in the wild.

Manta Superpower

Due to their immense size, giant manta rays have no natural predators. But when injured in the occasional killer whale or shark attack, they’re able to regenerate tissue at a remarkable rate, recovering from even large bites in a matter of weeks.

manta ray grooming baby manta ray

Spa Day

Mantas regularly visit reef “cleaning stations” where cleaner wrasse fish work to remove dead skin and parasites from the rays’ bodies. They often visit the same stations repeatedly—over the course of years or even their entire lives.

Big Baby

Females reproduce slowly, usually producing just 1 or 2 babies at a time, about every 2-5 years. Manta rays are ovoviviparous, meaning pups hatch from eggs inside the mother and are then born live—with a wingspan of up to a whopping 6 feet!

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