Tuatara vs Lizard for Kids
A tuatara can look like a sturdy spiny lizard, but resemblance does not place it inside the lizard family tree. The tuatara, Sphenodon punctatus, is the only surviving species of Rhynchocephalia, an ancient reptile order closely related to Squamata. True lizards belong to Squamata, so this page uses the common wall lizard, Podarcis muralis, as one exact lizard benchmark. Both have scales, claws, long tails, eggs, basking behaviour, and insect-rich diets. The tuatara is much larger, lacks an external ear opening, carries two upper tooth rows around one lower row, stays active in unusually cool conditions, and reproduces extremely slowly. The wall lizard is a small sun-loving daytime sprinter with visible ear openings, replaceable teeth, rapid egg cycles, and a detachable tail.
Tuatara
- Type: Cool-Adapted New Zealand Rhynchocephalian Reptile
- Group: Living species Sphenodon punctatus, the sole surviving species of reptile order Rhynchocephalia, also called Sphenodontia in some sources, and family Sphenodontidae; it is a close lizard-and-snake relative but not a lizard
- Known for: Large triangular head, olive-to-grey speckled body, erectile crest of soft spines, no visible external ear openings, light-sensitive parietal eye most visible in young, two upper tooth rows and one lower row, cool-temperature activity, nocturnal adults, burrows, very slow growth, long incubation, and century-scale lifespan
- Diet: Carnivorous opportunist eating mainly beetles, wētā, worms, spiders, millipedes, and other invertebrates, plus occasional lizards, seabird eggs, chicks, and small animals
- Special skill: Remaining active at unusually low reptile body temperatures while using a light-sensing parietal organ, non-replacing jawbone teeth arranged as two upper rows around one lower row, and slow physiology suited to a very long life
Common Wall Lizard
- Type: Small Fast European Lacertid True Lizard
- Group: Living species Podarcis muralis, a true lizard in family Lacertidae within reptile order Squamata; it is the fixed lizard benchmark used instead of averaging the thousands of living lizard species
- Known for: Small slender body, extremely long tail, variable brown, grey, green, reticulated, and belly colour morphs, clear external ear openings, long toes and claws, fast daytime sprints, sun basking, rocky crevices, territorial signals, multiple egg clutches in favourable years, and tail autotomy with regrowth
- Diet: Mostly insectivorous hunter eating crickets, grasshoppers, beetles, spiders, worms, and other small invertebrates, with occasional fruit and berries
- Special skill: Burst-sprinting and climbing over walls and rubble with long limbs and claws, then escaping into a narrow crevice or releasing the tail so a wriggling piece distracts a predator while a replacement grows
Quick Answer
Quick answer: A tuatara is not a lizard. It is the only living rhynchocephalian, found only in New Zealand, with no external ear openings, non-replacing jawbone teeth in two upper rows and one lower row, a pronounced parietal eye in young, cool-weather activity, and eggs that can incubate for more than a year. The common wall lizard benchmark is a true squamate lizard from Europe, much smaller, visibly eared, fast and diurnal, and able to lay several small clutches in a favourable year.
Tuatara vs Common Wall Lizard: Quick Comparison
| Feature | Tuatara | Common Wall Lizard |
|---|---|---|
| Scientific identity | Sphenodon punctatus; order Rhynchocephalia | Podarcis muralis; order Squamata |
| Adult size | Males about 50 cm and up to roughly 1.5 kg on some islands | Usually about 14-23 cm total length, much of it tail |
| Native range | Endemic to New Zealand | Native across much of central and southern Europe into western Asia |
| Daily activity | Adults mainly nocturnal but also bask; young are more often active by day | Diurnal; hunts and basks in sunshine, then shelters in cracks |
| Temperature style | Can remain active near 5°C and avoids prolonged temperatures above roughly 25°C | Sun-loving wall climber whose running, digestion, and eggs depend strongly on warmth |
| External ears | No visible external ear opening or eardrum | A clear round external ear opening behind each eye |
| Teeth | Two upper rows and one lower row of non-replacing jawbone projections | Typical lacertid tooth rows along the jaws, with replacement through life |
| Head and back | Large head with eye-to-snout ridges and an erectile soft-spine crest | Angular small head, flat slender body, smooth-looking scales, and no tuatara crest |
| Movement and defence | Usually deliberate, powerful, burrow-based and motionless when hidden | Fast burst runner and climber that can enter cracks or shed and regrow its tail |
| Reproduction | Female lays a clutch only every 2-5 years; eggs take about 12-16 months | Female commonly lays 3-11 eggs and may produce several clutches in a warm year |
How Are Tuatara and Common Wall Lizard Alike?
- Both are living diapsid reptiles with dry scaly skin, lungs, four clawed legs, a long tail, internal fertilisation, shelled eggs laid on land, and ectothermic temperature control.
- Both bask when conditions allow, retreat into holes or crevices, use visual and chemical information, defend space, and can remain still and patterned against rocks, bark, soil, or vegetation.
- Both eat many insects and other invertebrates, seize food with the jaws, swallow small items, and can also take a few less common foods when opportunities appear.
- Both hatch as independent miniature reptiles without milk or parental teaching, and nest temperature can influence development even though the two species have very different incubation schedules.
- Both continue evolving today. Their old lineages do not mean that either animal is an unchanged copy of a fossil or a surviving dinosaur.
How Are Tuatara and Common Wall Lizard Different?
- The tuatara is the only living rhynchocephalian species, while the common wall lizard is one of thousands of squamate lizard species.
- An adult male tuatara can be about twice as long and vastly heavier than the slim wall lizard, whose long tail makes up much of its 14-23-centimetre length.
- A tuatara has no visible external ear opening, while a common wall lizard has a round ear opening behind each eye.
- The tuatara’s non-replacing jawbone teeth form two upper rows with one lower row sliding between them, while wall-lizard teeth occupy ordinary jaw rows and are replaced.
- Adult tuatara are mainly cool-active and nocturnal with a female breeding only every few years, while wall lizards are sun-loving daytime sprinters that may lay several clutches in one warm year.
Tuatara vs Common Wall Lizard Showdown
Adaptation showdown: Tuatara wins size because an adult male can reach about 50 centimetres and 1.5 kilograms, while the common wall lizard is usually about 14-23 centimetres including a very long tail. Wall Lizard wins speed as a locomotor adaptation because it is a documented fast-moving daytime burst sprinter, whereas adult tuatara often use deliberate movement and long motionless waits; this is not a matched straight-line race. Tuatara wins absolute strength because its far greater body mass, broad head, and interlocking shearing tooth rows handle larger, harder foods, although no shared bite-force test is available. Stealth is a Tie because tuatara blend beside burrows and stay motionless while wall lizards vanish into patterned stone and narrow cracks. Social behaviour is a Tie because both defend space and signal to neighbours without cooperative colonies or extended care. Swimming is a Tie because neither benchmark is an aquatic specialist. Tuatara wins weirdest for combining sole-surviving-order status, a light-sensing parietal eye, no external ear opening, two upper jawbone-tooth rows, extreme cool activity, century-scale longevity, and a reproductive cycle measured in years.
Fun Tuatara vs Common Wall Lizard Facts
A Tuatara Is Not a Lizard
Tuatara belong to Rhynchocephalia, also called Sphenodontia in some classifications. True lizards and snakes belong to Squamata. The two orders share a more distant reptile ancestor, so their four-legged, long-tailed outlines reflect kinship without making the tuatara a member of the lizard group.
The Teeth Are Part of the Jaw
A tuatara’s tooth-like points are serrated extensions fused with the jawbones and do not grow back when worn away. One lower row slides between two upper rows to grip and shear hard prey. A common wall lizard has ordinary lacertid jaw rows and repeatedly replaces teeth.
The Third Eye Is Real but Not for Pictures
A young tuatara has a parietal eye with a lens, retina, and nerve connections beneath a translucent patch on top of the head. Scales and pigment soon cover it. It detects light cycles rather than forming normal pictures, and related parietal organs also occur in many lizards, so it is not exclusive to tuatara.
Ancient Does Not Mean Unchanged
Rhynchocephalians flourished long before modern humans, and the tuatara is their sole living species. Calling it a living fossil can wrongly suggest that evolution stopped. Modern tuatara have continued adapting to New Zealand climates, food webs, diseases, and breeding conditions like every living species.
One Reproductive Clock Runs Very Slowly
A female tuatara may breed only every two to five years, store sperm for months, and lay eggs that incubate for 12-16 months with development pausing in cold weather. A common wall lizard can lay 3-11 eggs and, with enough sun and food, produce more than one clutch in a year.
Tuatara vs Common Wall Lizard Quiz
- Is a tuatara a true lizard? Answer: No. It belongs to Rhynchocephalia, while true lizards belong to Squamata.
- Which benchmark is larger? Answer: The tuatara.
- What visible head clue separates the common wall lizard? Answer: It has a round external ear opening behind each eye; the tuatara lacks one.
- How are a tuatara’s tooth rows arranged? Answer: Two upper rows surround one lower row when the jaws close.
- Which animal may lay several egg clutches in a warm year? Answer: The common wall lizard.
Tuatara vs Common Wall Lizard FAQ
What is the main difference between a tuatara and lizard?
A tuatara is the sole living rhynchocephalian, while true lizards are squamates; their skulls, ears, teeth, temperature biology, and reproduction differ.
Why does a tuatara look like a lizard?
The two orders are reptile relatives and inherited a similar four-legged body plan from shared ancestors, while later evolving along separate branches.
Does a tuatara really have three eyes?
It has two image-forming eyes plus a light-sensitive parietal eye on top of the head. The third organ becomes covered and does not see pictures like the main eyes.
Which is faster, a tuatara or common wall lizard?
The wall lizard wins the speed field because it is a small fast daytime sprinter; tuatara usually move deliberately and often wait motionless near burrows.
Are tuatara unchanged living fossils?
No. The phrase can describe their ancient surviving branch, but living tuatara have continued evolving and are not identical to their prehistoric relatives.
Animal Words to Know
- Rhynchocephalia: The reptile order containing the tuatara and its extinct relatives; some sources use Sphenodontia.
- Squamata: The reptile order containing all living lizards, snakes, and amphisbaenians.
- Parietal eye: A light-sensitive organ on top of the head that helps track daily or seasonal cycles rather than forming ordinary images.
- Autotomy: Deliberately releasing a body part, such as a wall lizard’s tail, to escape a predator.
- Incubation: The period during which an embryo develops inside an egg before hatching.
Make a Two-Order Reptile Detective Poster
Make a Two-Order Reptile Detective Poster
Create a two-order reptile detective poster at honest scale. In a cool New Zealand coastal-forest clearing beside a burrow, draw a male tuatara about 50 centimetres long with a heavy olive-grey speckled body, broad triangular head, strong limbs, long tail, eye-to-snout ridges, a tall row of soft pale triangular spines along neck and back, and no external ear opening. Add a hatchling head inset with only a tiny translucent parietal-eye spot and a mouth diagram showing two upper rows and one lower row. On a sunny European limestone wall, draw a common wall lizard only 14-23 centimetres long, slender and low with a tail about twice the body length, angular head, visible round ear opening, long toes and claws, brown-grey reticulated scales, small blue side spots on a male, and a quick dash into a crack. Add order branches, size bars, day-night clocks, temperature gauges, tooth diagrams, egg timelines, diet icons, and a note that ancient lineage does not mean unchanged animal.
Meet Each Animal
Want the full fact file? Here are quick highlights from each animal’s own facts page.
Tuatara Fact Highlight
From the full animal facts pageCommon Wall Lizard Fact Highlight
From the full animal facts pageMore Animal Comparisons
Pick another animal matchup and keep exploring. Tiny facts, big questions, very serious animal business.
Make an Animal Story
Send a cool-night tuatara and a sun-sprinting wall lizard through two ancient reptile branches with our free Animal Story Generator.