By Grant Valentine
August 26, 2025
With the biggest brain of any fish in the world and a wingspan of 29 feet, the giant manta ray is certainly proof that not all good things come in small packages. Peaceful filter feeders gliding through the water with wing-like appendages provide unique evidence that all creatures - great and small - are fearfully and wonderfully made.
Photo by Gerald Schömbs on Unsplash
Like the whale shark, giant manta rays are the largest of their kind and filter feed on plankton. They can swim up to 15 mph (7 times faster than an average human), weigh up to 5,300 pounds, and live about 45 years on average. They have unique spot patterns on their underside, so individuals (like our animal ambassador) are easily recognized. Sprouting from their heads, what look like horns are cephalic lobes, which can be curled and folded in a number of ways. Uses for these include eating and communication with other rays. They are also visually distinct with black lines forming a "T" at the top of their head at the front, where other types of mantas (like the reef manta) may have a more rounded head, forming a "Y" instead.
Giant manta rays are migratory, so you won't often see one in the same place. They typically migrate following the direction the currents take their food, but a preference for warmer waters and other factors make their migrations somewhat unpredictable. They can be found in many places around the world, including every ocean from tropic to temperate, and even some coastal areas that provide plenty of food. Their high intelligence helps to decide the best location to stay and feed.
Despite their size, a giant manta ray has no real way of hurting people. Without a stinger or teeth, the worst it can do is slap someone across the head. That said, you should always keep your distance from wild animals, for your safety as much as theirs.
Photo by Emma Li
As filter feeders, giant mantas eat zooplankton and, less commonly, small fish. As they swim, they stretch their cephalic lobes to strategically flow more water and food into their wide-open mouths (see the photo on the left). Specifically, these foods are usually krill, shrimp, or the larvae of crustaceans. When they do feed, they are usually no deeper than around 30 feet, however they have been observed diving and feeding up to 3,280 feet deep. This is dependent on the current prey available.
Like many fish, giant manta rays have Ampullae of Lorenzini, which are sensory organs in their skin. Using these, they can detect the electric fields emitted by other creatures such as plankton and easily find their next meal.
When a female ray reaches sexual maturity at 10-15 years old, males will take notice of her and follow in a single file line until only one is left. Typically, she will give off pheromones to tell the last man standing she is ready. He will hover above the female and insert one of his two claspers into her cloaca, which fertilizes the egg and creates a beautiful new manta ray.
After this, a baby bump will be noticeable on the mother, and pregnancy will take around 13 months. Eventually, the baby will hatch from its egg while still inside its mother, then she will give live birth. Only one pup is born, but like humans, they are (quite rarely) capable of carrying twins. Also like humans, the baby's unique spots on its underside may share patterns with its mother.
Mothers choose to give birth near the coast, and the pups will remain in shallow waters until they are a few years old. Once they are born, the giant manta ray's mother will leave it to fend for its own. Using the reef environment it was born in, the baby will learn to use its surroundings as defense against predators, and how to locate and eat plankton.
Mentioned in the Scriptures are many mythical-sounding beasts, including the Basilisk (Psalm 91), a unicorn (Numbers 4), and Leviathan (Psalm 74, Job 41) - could this Leviathan be a giant manta? Maybe not, as it's described with a tongue (Job 41:1) and rays don't have those - but that could also just be Old Testament imagery and not a literal physical description. Either way, there are many stories throughout world history of giant aquatic creatures terrorizing sailors. Perhaps some stories describe giant manta rays.
In some eastern cultures, their gill plates are thought to be medicinally beneficial, however this has been disputed or disproved in studies. Sadly, this leads to a huge number of avoidable deaths of rays (see Conserving God's Creatures section).
“How many are your works, Lord! In wisdom you made them all; the earth is full of your creatures. There is the sea, vast and spacious, teeming with creatures beyond number— living things both large and small.”
Psalms 104:24-25 (NIV)
The Great Barrier Reef is home to an enormous number of creatures, not the least of whom is today's animal ambassador, Taurus.
As a melanistic ray, Taurus is mostly black, with his unique spots on his underside being white. Identified by these spots, Taurus has been spotted 50+ times off the coast of Lady Elliot Island and never anywhere else, which makes him a stationary member of a largely migratory species.
Though there's not a definitive way to tell a manta's age, we can tell if they are sexually mature. When he was first identified in 1982, Taurus was already mature. So the fact that he's alive today - making him at least 50 - means he may be the oldest manta ray in the world.
Because of their size, giant manta rays have a habit of accidentally getting caught in nets or other fishing articles, regardless of whether or not they were the target. More importantly, their size also makes them easy to find for those who do want to kill them - including those harvesting their gill plates in the east. Sadly, these factors contribute to the giant manta ray's conservation status: Endangered.
That's a word no animal wants to be associated with, and sadly the giant manta ray has become part of the 30% of all sharks and rays threatened with extinction. Efforts to mitigate the slaughter of giant mantas are either light-handed in the west or non-existent in the east. Their very low breeding rate also contributes to decreasing numbers.
It's never a good circumstance when even pollution isn't an aquatic creature's greatest threat, but you can still help them by mitigating pollution in our oceans as much as you can. Help manta rays by recycling, taking care of your waste in responsible ways (visit Recycle Across America for more info). Additionally, picking up litter you see on beaches or bays could prevent toxic chemicals entering waters that manta rays inhabit.
An easy and fun way to help is by adopting a manta ray from the Marine Megafauna Foundation. Though it's a metaphorical adoption (you aren't really sponsoring a specific individual), you are still helping support manta ray research and conservation through the MMF.
It's important to remember why we conserve animals. While we rule over every living creature (Genesis 1:28), we are also called to care for God’s perfect creation and keep it fruitful so that future generations can enjoy it as we do. So, while not made in the image of God like we are, animals are still made by Him and we are disrespecting His handiwork if we are not protecting them.
⬤ Manta Ray Advocates (Senses and Reproduction) ⬤ NOAA ⬤ Forbes ⬤ Marine Megafauna Foundation ⬤
Header photo by Kyle Loftus on Unsplash