6 Animals With Big Teeth: From Ocean Giants to Prehistoric Predators
October 26, 2026
A male walrus tusk can stretch nearly three feet from gum to tip, and a Tyrannosaurus rex tooth root ran deep enough to anchor a blade the length of a steak knife. Teeth this size are not just for eating. Across the animal kingdom, animals with big teeth use their oversized chompers for combat, defense, digging, and even climbing out of icy water.
This list moves from the Arctic ice to the African savanna, then back roughly 66 million years to the age of dinosaurs, to look at six species whose teeth do far more than chew. Readers curious about the opposite extreme can compare notes with the animals that get by without any teeth at all. Below, the walrus, great white shark, Tyrannosaurus rex, giant armadillo, grizzly bear, and hippopotamus each get a closer look at what their teeth are built to do.
| Animal | Approximate Tooth Count | Standout Tooth Feature |
|---|---|---|
| Walrus | 18 teeth total | Tusks up to 3 feet long |
| Great White Shark | About 300 at a time | Up to 30,000 replaced over a lifetime |
| Tyrannosaurus Rex | 50 to 60 teeth | Longest tooth on record: 12 inches |
| Giant Armadillo | Up to 100 teeth | Most teeth of any land mammal |
| Grizzly Bear | 42 teeth | Long canines for grasping prey |
| Hippopotamus | Large tusk-like set | Canines reaching 1.5 feet |
1. Walrus
The walrus (Odobenus rosmarus) carries one of the most recognizable dental features in the animal kingdom. According to A-Z Animals, walruses have a total of 18 teeth, including two prominent tusks, and walrus tusks are elongated, modified canine teeth that can reach up to 3 feet long in males. Females grow tusks too, but male tusk length runs 18 to 22 percent longer, and male tusks are over 40 percent thicker than those of females.
Walrus tusks continue to grow throughout their lives, and walruses do not use their tusks for feeding. Instead, males use their tusks for dominance displays and to fight for position on the ice floes, and the same tusks double as tools for climbing, pulling themselves out of the water, digging holes in the ice, and moving ice floes so they have room to enter and exit the water.
Even the walrus’s scientific name reflects this behavior. Discover Magazine notes that the first part of the walrus’s scientific name, Odobenus rosmarus, translates to tooth-walking, since the creature’s enlarged upper canines are so large they use them to pull themselves up onto icebergs — no small feat considering adults can weigh up to two tons. Readers interested in similar dental hardware can browse other animals with tusks that rely on modified teeth for everything but eating.
Pro Tip: A quick way to spot a male walrus from a distance is tusk thickness rather than length alone — males carry noticeably stockier tusks than females of similar size.
2. Great White Shark
The great white shark (Carcharodon carcharias) is famous for rows of serrated teeth, but the total count at any given moment is smaller than most people assume. Discover Magazine reports that great whites only have about 300 teeth at any one time, though the fact they replace teeth means they might go through as many as 30,000 through their lifetimes.
That constant turnover is by design. Sharks maintain multiple rows of backup teeth that rotate forward as older ones wear down or break off during a strike, which keeps every bite as sharp as the last. This ongoing replacement is one reason sharks stay near the top of most tooth-count rankings even without the single largest tooth in the ocean. For readers comparing sensory adaptations rather than dental ones, the guide to animals with the best hearing covers how sharks and other predators detect prey long before they ever bite down.
3. Tyrannosaurus Rex
Few prehistoric predators are as closely tied to their teeth as Tyrannosaurus rex. According to FossilEra, Tyrannosaurus rex had approximately 60 robust serrated teeth that were wide and dull compared to the flat and dagger-like teeth of other carnivorous dinosaurs, and it holds the record for tooth size, with the longest recorded tooth measuring 12 inches long.
Those teeth were not simple blades. Paleontologist Kirstin Brink of the University of Toronto Mississauga, cited by CBC News, found that internal dental tissues were arranged in a way that reinforced the strength and prolonged the life of teeth that were serrated like steak knives for easy dismembering of other dinosaurs. Brink explained that the serrations were most efficient for piercing flesh and gripping it while ripping off a chunk of meat, called the “puncture and pull” feeding style.
Key Insight: T. rex teeth were not razor-thin cutting blades. Their thick, rounded cross-sections were built to grip and tear rather than slice, which let the dinosaur crush bone without shattering its own teeth in the process.
That bone-crushing ability set the T. rex apart from lighter-jawed relatives like Allosaurus. Anyone curious about other prehistoric names can browse additional animals that start with T, several of which share the same predatory lineage.
4. Giant Armadillo
The giant armadillo (Priodontes maximus) is an unlikely record holder. American Oceans notes that the giant armadillo has the most teeth of any land mammal, with an impressive number of 74 to 100 teeth, while other sources round that figure up. Either way, it beats every other land mammal on sheer count alone.
Important Note: Tooth counts for the giant armadillo vary slightly by source, ranging from the mid-70s to just over 100. The discrepancy comes from natural variation between individuals and ongoing tooth replacement rather than disagreement about the species’ overall record.
Unlike most mammals, the giant armadillo has no incisors or canines at all. CDHP explains that armadillos have a simple homodont dental formula of just molars, while humans have four different tooth types, and the giant armadillo has taken this to the extreme with up to 17 molars in each rear jaw quadrant. On top of that volume, armadillos can continuously replace lost or damaged teeth throughout their lifetimes, which keeps their insect-grinding jaws working for years.
The species’ heavy armor plating gets just as much attention as its teeth. Readers can explore other animals with shells and armored bodies, and compare the giant armadillo’s dental record against other species featured in the guide to animals with the most teeth.
5. Grizzly Bear
The grizzly bear (Ursus arctos horribilis) is often mentioned in the same breath as the world’s biggest cats when it comes to tooth size. Northstar Family Dentistry notes that the largest of the big cats has the largest teeth of any mammalian predator alive, though grizzly bears come close.
A grizzly’s mouth reflects its omnivorous lifestyle. Long, curved canines handle salmon and other prey, while broad molars toward the back of the jaw grind berries, roots, and vegetation that make up much of its diet outside salmon season. That dual-purpose dental setup lets grizzlies switch between meat and plants depending on the season without needing separate specialized teeth.
Grizzlies also rely on formidable claws that work alongside their teeth for digging and foraging, which puts them on any list of animals with claws worth comparing to their bite. Between long canines and a bite that can crush bone when needed, grizzlies remain one of the few living land predators that can rival prehistoric jaw power. Bears that survive into old age also make an interesting case study among animals with the longest lifespan, since wild grizzlies can live for decades when food sources stay stable.
6. Hippopotamus
The hippopotamus (Hippopotamus amphibius) is technically a herbivore, but its teeth look built for combat rather than grazing. A-Z Animals notes that sub-Saharan Africa is home to hippopotamuses, which are the third-largest living land mammals after elephants and white rhinoceroses, and hippos typically measure 10.8 to 16.5 feet in length.
The teeth inside that enormous body match its scale. According to Auburn Dr. Lee Family Dentistry, a hippo’s incisors grow up to 1.2 feet, while its lower canines reach up to 1.5 feet in length, all housed inside a mouth about 2 feet across that can open a massive 4 feet wide. Despite that arsenal, hippos spend most of their time grazing rather than fighting, using their broad, flat back teeth to crush and grind tough grasses much like the feeding habits described in animalofthings.com’s roundup of big-toothed species.
Those same canines have made hippos a conservation concern. The same Auburn dental source notes that hippo teeth are a source of ivory for which hippos have increasingly been targeted, and the hippopotamus is now a vulnerable species with a declining population. Digesting tough plant matter also demands more than sharp molars — hippos process grasses through a complex, multi-chambered stomach, placing them alongside other animals with multiple stomachs despite not chewing cud the way cattle do.
Pro Tip: A hippo’s yawn is rarely a sign of sleepiness. Wide-mouth displays are usually a warning to rivals or intruders, and the bigger the gape, the more seriously it should be taken.
From tusks that double as ice picks to molars built to outlast a dinosaur’s bite force, these six species show that big teeth rarely serve just one purpose. Whether the goal is defending territory, breaking down tough food, or simply surviving long enough to pass those genes along, oversized teeth remain one of evolution’s most reliable solutions across both living animals and the fossil record.