14 Largest Reptiles in the World, Ranked by Size and Weight
October 24, 2026
A male saltwater crocodile can weigh more than a small car and still move through water almost silently. That single fact sets the tone for this list: the largest reptiles in the world are not just long, they are built with a mass and muscle that rivals some of the biggest mammals on the planet.
From armored crocodilians and constrictor snakes to lumbering tortoises and deep-diving sea turtles, reptilian giants occupy nearly every warm habitat on Earth. This list ranks 14 of the biggest species by verified length and weight records, drawing on data from wildlife researchers, zoos, and conservation groups. For context on how these animals compare to other giants in the wild, see this breakdown of the biggest animals in the world.
Pro Tip: When comparing reptile “size,” check whether a source means length or weight. A snake can be the longest species on record while weighing far less than a stockier crocodile or tortoise of similar length.
1. Saltwater Crocodile
The saltwater crocodile (Crocodylus porosus) holds the title of the largest living reptile on Earth, a distinction confirmed by multiple wildlife authorities. The saltwater crocodile is the largest living reptile on Earth, with adult males reaching about 5m and 500kg, while females are much smaller, typically under 3m long and weigh less than 100kg. Exceptional individuals grow far beyond the average.
The species has been verified at up to 6.32 m (20.7 ft) in length and around 1,000–1,500 kg (2,200–3,300 lb) in mass, with larger, unverified specimens purportedly reaching 7 m (23 ft) and an estimated 2,000 kg (4,400 lb). The largest captive crocodile on record, a Philippine saltwater crocodile named Lolong, measured 6.17 m (20 ft 3 in) and weighed 1,075 kg (2,370 lb), making him one of the biggest individuals ever documented.
This species ranges across brackish estuaries and coastal waters from Sri Lanka, India, Bangladesh, and Myanmar east to the Solomon Islands and Vanuatu and south to Australia’s northern coast. Its hunting style relies on patience and explosive power rather than speed over distance, and it can swim about 15 to 18 miles per hour when attacking, though only for short bursts, illustrating the predatory instincts that keep it at the top of its food web. Readers curious about speed among reptiles more broadly can compare notes in this guide to the fastest reptiles in the world.
Saltwater crocodiles also travel enormous distances using ocean currents instead of swimming energy. They ride currents by simply floating, waiting for the current to take the direction they need, and satellite tracking showed one crocodile traveling over 400 km in 20 days. For a sense of how this mass compares to other heavyweight species, see the full rundown of the heaviest animals in the world.
2. Nile Crocodile
The Nile crocodile (Crocodylus niloticus) ranks as the second-largest living reptile and the largest predator on the African continent. Adult males typically measure between 3.5 and 5 m (11 ft 6 in to 16 ft 5 in) and weigh 225 to 750 kg (496 to 1,653 lb), though specimens exceeding 6.1 m (20 ft) and 1,000 kg (2,200 lb) have been recorded.
Sexual dimorphism is pronounced in this species: females are usually about 30% smaller than males. Despite their bulk, Nile crocodiles display surprisingly social behavior around shared resources. They share basking spots and food sources like schools of fish and large carcasses, though competition over a kill can turn aggressive, and documented cases of larger individuals preying on smaller crocodiles of their own species are part of the harsher side of crocodilian life.
In length-for-length comparisons, Nile crocodiles sit just behind their saltwater cousins. The Nile crocodile is typically 9 feet 8 inches to 14 feet 5 inches (2.94–4.4 meters) and weighs 496 to 914 pounds (225–414 kilograms), figures that place it comfortably among the planet’s largest living predators.
3. Orinoco Crocodile
The Orinoco crocodile (Crocodylus intermedius) is one of the most endangered crocodilians, but it remains among the largest. It ranks among the largest living reptiles and the largest predator in the Americas, and may be, on average, the largest crocodilian in the Americas, with only the American crocodile, black caiman, and American alligator approaching similar dimensions.
Historical records suggest this species once grew even larger than it does now. Males have been reported up to 6.8 m (22 ft 4 in) in the past, weighing over 900 kg (2,000 lb), though such sizes do not exist today; a large male now may attain 4.2 m (13 ft 9 in) and weigh up to 450 kg (1,000 lb), while females are substantially smaller, with the largest likely weighing around 225 kg (496 lb).
Found only in the Orinoco River basin of Venezuela and Colombia, this crocodile’s population decline makes long-term field data scarce. The ecology of the Orinoco crocodile is poorly documented in the wild, largely because of its small population. Conservation programs now focus on captive breeding to rebuild wild numbers before this reptilian giant disappears entirely.
4. American Crocodile
The American crocodile (Crocodylus acutus) ranges from the southern tip of Florida through Central America and into parts of South America, tolerating both fresh and salt water. According to a widely cited reptile-size reference table, the species reaches a mass range of 150–600 kg, a maximum recorded mass of 1,283 kg, and a maximum length of 7 meters, placing it among the heaviest crocodilians on record despite its smaller average size compared to saltwater and Nile crocodiles.
Unlike its more aggressive relatives, the American crocodile is generally less prone to attacking humans, though it remains a powerful apex predator within its range. Mangrove-lined coasts and river deltas give this species the cover it needs to ambush fish, birds, and mammals that wander too close to the water’s edge.
Key Insight: Four of the world’s largest reptiles are crocodilians. Their combination of armored skin, powerful jaw muscles, and semi-aquatic ambush tactics has made this body plan one of evolution’s most durable designs, largely unchanged for tens of millions of years.
5. Reticulated Python
Among snakes, the reticulated python (Malayopython reticulatus) holds the record for sheer length. This species of Southeast Asia has been reported to measure as much as 8 m (26 ft) in length and weigh up to 168 kg (370 lb), making it longer than the green anaconda though more slender.
Its habitat range is unusually broad for such a large predator. At up to 10m long, the reticulated python is the world’s longest snake and among the heaviest, capable of swallowing large animals whole and occasionally posing danger to humans, and it is found across the rainforests, woodlands, grasslands, and even sewers of South and Southeast Asia. Readers interested in how this species stacks up against other giant serpents can explore the complete list of the largest snakes in the world.
6. Green Anaconda
While the reticulated python wins on length, the green anaconda (Eunectes murinus) is the heaviest snake alive. It is the most massive living member of the snake order, and individuals of the neotropical riverways may exceed 6 m (20 ft) and 200 kg (440 lb), although the largest reports are not fully verified.
Typical specimens are somewhat smaller than the maximum records suggest. Green anacondas measure 9.8 to 15 feet on average and typically weigh 70 to 150 pounds, though the largest specimen ever recorded weighed 550 pounds. This species kills using constriction rather than venom, a hunting method that lets it take down prey far larger than its own head.
It kills prey as large as a deer by constriction, wrapping coils around the chest until the animal can no longer breathe. Native to the flooded forests and rivers of South America, the green anaconda has also become an invasive concern in parts of Florida after escaped or released pets established breeding populations.
Common Mistake: People often assume the “biggest snake” title belongs to one species. In reality, the reticulated python is longer on average, while the green anaconda is heavier and bulkier — the two records belong to different animals.
7. Komodo Dragon
The Komodo dragon (Varanus komodoensis) is the largest living lizard, found only on a handful of Indonesian islands. This lethal lizard can kill prey twice its size thanks to its large size, powerful bite, and aggressive nature, reaching lengths of up to 3m and weighing up to 150kg.
Record-breaking individuals push well past typical measurements. Komodo dragons typically measure 7.5 to 8.5 feet long and weigh 150 to 200 pounds, though the largest ever recorded was 10.2 feet long and 365 pounds. Males grow noticeably larger than females, a pattern consistent with the predatory instincts in wildlife that favor bigger, more dominant hunters.
One of the species’ most striking survival behaviors involves its own young. Hatchling Komodo dragons spend much of their early life in trees, largely to avoid being eaten by adults of their own species — a stark reminder of nature’s harsh realities and a documented case of cannibalism in animals that helps explain why juvenile mortality is so high before dragons reach a size where they are no longer easy prey.
8. Leatherback Sea Turtle
The leatherback sea turtle (Dermochelys coriacea) is the largest turtle species on Earth and one of the deepest-diving marine reptiles known to science. It is the largest turtle in the world and one of the deepest diving marine animals, and it is also the fastest-moving reptile.
Unlike other turtles, it has traded a hard shell for a more flexible design suited to deep water pressure. To allow for these traits, this turtle sacrificed the hard shell; its carapace consists of a layer of thin, tough, rubbery skin reinforced underneath. That design has not limited its growth potential.
The leatherback turtle is one of seven sea turtle species and the world’s biggest, with the largest individual ever recorded measuring 2.91m and weighing 916kg, though most individuals still exceed 1.7m and 454kg. Leatherbacks range across tropical and temperate oceans worldwide, migrating thousands of miles between feeding and nesting grounds each year.
9. Green Sea Turtle
The green sea turtle (Chelonia mydas) is the second-largest sea turtle species and a familiar sight in warm coastal waters around the world, including the reefs and lagoons of Hawaii. Green sea turtles are one of the largest reptiles in the world and the second-largest turtle species, measuring 3 to 4 feet and weighing 300 to 350 pounds.
Exceptional individuals have reached sizes that rival small crocodiles. The largest green sea turtle on record weighed 871 lbs and measured 5 feet long, which is as large as some crocodiles. Despite their size, green sea turtles feed mainly on seagrass and algae as adults, a diet shift from the more carnivorous habits of juveniles.
Populations in places like Hawaii face ongoing pressure from habitat loss and boat strikes, which is one reason conservation groups continue to track nesting beaches closely; readers can learn more in this overview of endangered animals in Hawaii.
10. Galápagos Tortoise
The Galápagos tortoise (Chelonoidis niger) is the largest living tortoise species and exists only on the Galápagos Islands. This tortoise is endemic to the Galápagos Islands, and males, the larger sex, can weigh more than 500 pounds.
Formal size data places this species among the heaviest reptiles anywhere. Within reptile size rankings, the Galápagos tortoise carries a mass range of 150 to 300 kg, with a maximum recorded mass of 417 kg and a maximum length of 1.8 meters. The largest confirmed specimen on record weighed 919 pounds, according to A-Z Animals research.
Slow metabolism and a plant-based diet support an extraordinarily long lifespan, often exceeding a century. For more on animals that trade speed for longevity and energy efficiency, see this list of the slowest animals in the world.
11. Aldabra Giant Tortoise
The Aldabra giant tortoise (Aldabrachelys gigantea) rivals its Galápagos cousin in size and is native to the Aldabra Atoll in the Seychelles. According to the Smithsonian’s National Zoo, Aldabra tortoises can reach sizes of up to 550 pounds and ages of up to 150 years old.
Males and females differ substantially in size. The male’s carapace length can measure 4 feet (1.22 meters) with a weight up to 550 pounds (250 kilograms), while the female’s carapace measures 3 feet (91 centimeters) and reaches 350 pounds (159 kilograms). The heaviest free-roaming individual ever documented set an even higher record.
An Aldabra tortoise weighing 672 pounds (305 kilograms) is the world’s largest free-roaming tortoise ever recorded. These tortoises demonstrate classic animal survival behaviors suited to island life, including the ability to go without food or water for extended periods by storing reserves in their large bodies.
12. Alligator Snapping Turtle
The alligator snapping turtle (Macrochelys temminckii) is the largest freshwater turtle in North America, named for the ridged shell and powerful jaws that resemble an alligator’s hide. This prehistoric-looking species is the largest freshwater turtle in North America and among the largest in the world, often called the dinosaur of the turtle world.
Typical weights fall well short of the most dramatic unverified reports. Alligator snapping turtles typically weigh between 155 and 175 pounds, though exceptional individuals push far beyond that baseline. Though not verified, a 183 kg (403 lb) alligator snapping turtle was reportedly found in Kansas in 1937, and a 16-year zoo resident weighed a confirmed 113 kg (249 lb).
Hunting technique in this species relies on deception rather than pursuit. The alligator snapper employs a unique natural lure in its hunting technique: its tongue sports a bright-red, worm-shaped piece of flesh that, when displayed by a motionless turtle on a river bottom, draws curious fish or frogs close enough to be snatched.
Important Note: Several widely repeated weight records for the alligator snapping turtle, including figures above 400 pounds, lack solid documentation. Treat extreme numbers from unverified historical reports with caution when comparing species.
13. Loggerhead Sea Turtle
The loggerhead sea turtle (Caretta caretta) is the world’s second-largest living turtle species, trailing only the leatherback. It is the world’s second largest extant turtle after the leatherback sea turtle, with adults weighing approximately 80 to 200 kg (180 to 440 lb), averaging around 135 kg (298 lb), and a straight-line carapace length range of 70 to 95 cm (28 to 37 in).
Its oversized head and jaw muscles give the species its name and its feeding specialty. The average loggerhead measures around 90 cm (35 in) in carapace length when fully grown, with an adult weight of approximately 135 kg (298 lb) and the largest specimens weighing about 200 kg (440 lb). Those jaws allow loggerheads to crush hard-shelled prey like clams, crabs, and sea urchins that softer-mouthed turtles cannot access.
Loggerheads nest on beaches across the Atlantic, Pacific, Indian, and Mediterranean coastlines, making them one of the most widely distributed large reptiles in the ocean. The loggerhead sea turtle is found in the Atlantic, Pacific, and Indian Oceans, as well as the Mediterranean Sea.
14. Asian Water Monitor
The Asian water monitor (Varanus salvator) is the second-largest lizard species alive, behind only the Komodo dragon. Native to South and Southeast Asia, this semi-aquatic predator is a strong swimmer that moves comfortably between rivers, mangroves, and urban canals across its wide range.
Adult males commonly exceed two meters in length, with well-documented individuals approaching three meters and weighing in the range of 20 to 25 kilograms, though unverified reports describe heavier outliers. Its diet is broad and opportunistic, including fish, birds, small mammals, carrion, and occasionally eggs raided from crocodile or turtle nests, a reminder that even among reptilian giants, flexible predatory instincts often matter more than raw size.
Unlike many of the other species on this list, the Asian water monitor remains common across much of its range, partly because it adapts well to human-altered landscapes. Dense populations persist in city canals and agricultural drainage systems, a trait that sets it apart from endangered giants like the Orinoco crocodile or alligator snapping turtle.
The size diversity among the world’s largest reptiles reflects millions of years of evolutionary specialization, from ambush predators in rivers to slow-moving island grazers. Each species on this list earned its size through a distinct survival strategy, whether that means raw bite force, constriction power, or simply outliving every predator that might otherwise pose a threat. Readers interested in how these reptilian giants compare to other record-holding animals can also explore the largest amphibians in the world for a sense of how cold-blooded animals scale up across different classes.