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Chinese Water Dragon
Reptiles

Chinese Water Dragon

Physignathus cocincinus

Semi-aquatic emerald climber with room-sized needsAdvanced

Lifespan
10-15 years, up to 20 with great care
Size
2-3 ft, roughly two-thirds tail
Social needs
Solitary safest; never two males
Time
High - daily misting, water care
Cost
High
Diet
Insectivore/carnivore, minor plant matter

Overview

What is this animal?

  • The Chinese water dragon is a glossy green, semi-aquatic agamid from the forested riverbanks of Southeast Asia, spending its life climbing branches above water and diving in when alarmed.
  • Males reach about 3 ft and females 24-30 in, though roughly two-thirds of that length is tail, and adults are crested, long-limbed and strikingly iguana-like.
  • Despite the shared name, it is nothing like a bearded dragon: it needs tropical humidity, real vertical height and a swimming pool rather than a hot, dry desert tank.
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  • Juveniles are sold cheaply at 8-10 in, which hides the fact that a healthy adult lives 10-15 years (sometimes to 20) and needs a custom room-corner enclosure with filtered water.
  • This is an advanced-keeper species.
  • Many on the market are still wild-caught imports arriving stressed and parasitised, so seek out a captive-bred animal from a reputable breeder and expect to build its home yourself.

Temperament

  • Chinese water dragons are gentler and more tractable than green iguanas, and with slow, consistent, ground-up interaction many become calm enough to hand-feed and perch on an arm.
  • Taming takes months of patience, and forcing handling on a new or wild-caught animal teaches it only fear.
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  • They are fast, flighty prey animals whose escape reflex is to leap, sometimes straight at glass, so interaction is safest inside or directly at the enclosure rather than loose in a room.
  • Their claws are sharp from climbing, and the tail can be lashed or broken and does not regrow.
  • Males must never be housed together and will fight seriously, and even a male seeing his own reflection may attack the glass.
  • A single dragon is the safest arrangement, and the one this guide recommends.

A good fit for

  • Experienced keepers ready to build a custom enclosure
  • Those wanting a gentler alternative to a green iguana
  • Fans of planted, bioactive, high-humidity vivariums
  • Keepers home daily for misting and water changes
  • People who enjoy slow, patient taming work

Common mistakes to avoid

  • Snout-rubbing injuries are near-universal in small glass tanks
  • No off-the-shelf vivarium is big enough for an adult
  • Swimming water fouls daily and needs filtration or full changes
  • Many for sale are wild-caught and heavily parasitised
  • Needs the opposite of bearded dragon care despite the name
  • Cheap juveniles hide a 7 x 4 x 6 ft-enclosure, 15-year commitment

Enclosure

Minimum 27 sq ft of floor · 7 x 4 x 6 ft

Must be housed alone. Solitary safest; never two males

  • An adult needs a tall, custom-built enclosure.
  • Specialist and veterinary care sheets give a minimum of about 6 x 3 x 6 ft for one adult, but Austrian law asks for at least 27 square feet of floor for one or two, so plan on at least 7 x 4 x 6 ft; more floor space and more height are always better.
  • A standard off-the-shelf 4 ft vivarium is far too small on length and height alike, so most keepers commit to a room-corner build.
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  • Fill that height with sturdy diagonal branches, cork trunks and dense live or artificial foliage, since these lizards perch above water and feel exposed without cover.
  • A large water feature the dragon can fully submerge and swim in is essential, not optional, and should cover a substantial part of the floor.
  • They routinely defecate in their water, so it needs aquarium-grade filtration or a full change every day to prevent skin and gut infections.
  • Keep a basking surface of 90-95°F, warm daytime ambients of 81-86°F and a cooler end around 75-79°F, with a night drop that may fall to 70-75°F but no lower.
  • Hold humidity at 60-80% through twice-daily misting or an automatic mister plus the large water surface, and run strong UVB across the basking zone, using a high-output T5 tube of roughly 6% (Ferguson Zone 3) positioned so the dragon basks about 10-12 in from it.
  • Cover or visually break up the lower glass, because water dragons do not perceive glass as a barrier and will rub and ram their snouts against it.

Check your enclosure

Supplies

Setup

  • Custom enclosure, 7 x 4 x 6 ft
  • Heating and thermostat
  • UVB fixture and bulb
  • Thermometers and hygrometer
  • Pool filtration (canister or pond filter)
  • Substrate, branches, foliage and decor

Ongoing

  • Live dubia roaches, crickets and locusts
  • Earthworms, silkworms or hornworms for variety
  • Frozen pinky mice for occasional feeding
  • Plain calcium powder without D3
  • Calcium with D3 and a reptile multivitamin
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  • Feeder gut-load and a ventilated tub
  • Long feeding tongs
  • Large water bowl or basin that is easy to drain

Safe substrate: Topsoil and coco fibre mix · Leaf litter over a soil base · Cypress mulch or orchid bark

Work out the cost

Care routine

Daily

  • Change the pool water (unless it is filtered)
  • Check temperatures and humidity
  • Fresh water bowl
  • Look the animal over
  • Mist and check humidity
  • Spot-clean waste and uneaten food
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Every few days

  • Feed to the species' scheduleevery 2 days
  • Check the snout and jawevery 3 days
  • Short handling sessionevery 3 days

Every few weeks

  • Weigh-inevery 2 weeks

Monthly

  • Deep-clean decor, glass and bowls
  • Test thermostats, lamps and guards

Less often

  • Refresh the substrateevery 3 months
  • Check the UVB lamp's age and replace it if due (if one is fitted)every 6 months

Vet: Annual exam with a snout and jaw check, every 12 months (every 6 months from 8 years old)

Tools

Is your enclosure big enough?Check your measurements against the recommended sizeWhat will it cost?Setup, monthly and over its whole life, itemisedCan it eat that?Search 30 foods, from everyday to never

Care in depth

Diet

Insectivore/carnivore, minor plant matter
  • Chinese water dragons are primarily insectivores, taking a varied rotation of gut-loaded dubia roaches, crickets, locusts, earthworms and black soldier fly larvae, with silkworms and hornworms as excellent lower-fat additions.
  • Adults can also take the occasional vertebrate item such as a pre-killed pinky or fuzzy mouse, but these are rich treats rather than staples, and feeder fish should be offered only sparingly because many species carry thiaminase and parasites.
  • Dust insects with calcium at most feedings and with a vitamin D3 supplement on a schedule, as this species is as vulnerable to metabolic bone disease as any diurnal basking lizard.
  • A small amount of finely chopped greens and fruit can be offered and is sometimes eaten, but plant matter is a minor part of the diet, unlike in a bearded dragon.
  • Feed juveniles daily and adults every two to three days, adjusting for body condition.
  • Overfeeding rodents, waxworms and superworms produces obese, short-lived dragons.

Health

Signs of good health, and the common problems
  • The signature injury of this species is rostral damage: snout rubbing and nose-ramming against glass in undersized or poorly screened enclosures, leading to abrasions, jaw swelling and bone infection.
  • It is so common in small tanks as to be near-universal, and the fix is space, visual barriers and planted cover, not ointment.
  • Metabolic bone disease from inadequate UVB and calcium, respiratory infections from cool or dry conditions, and skin and tail infections from standing in fouled water are the other major killers.
  • Wild-caught imports frequently carry heavy parasite loads, so a faecal exam with an exotics vet should follow any purchase.
  • Females can produce infertile eggs without a mate and need a deep, warm lay box of moist sand-soil to avoid fatal egg-binding.
  • Watch for a dull, brownish cast to the skin, sunken eyes or a kinked tail base, and find a reptile-experienced vet before you need one.

Is this urgent?

8 warning signs and how fast to act, 5 of them right away

Most reptile emergencies are husbandry emergencies first. Before you panic, check the temperatures, but check them with a thermometer, not a hand.

Go now

Gasping or open-mouth breathing away from the basking spot, or bubbles and mucus at the nose or mouth (a mouth held open while basking is normal cooling behaviour in many lizards)Go now. Raise the warm end to the top of the species range in transit. Respiratory infection in a reptile is usually already established by the time it is visible, and it advances fast at the wrong temperature.
Now
Prolapse: any tissue protruding from the ventGo now. Keep the tissue moist with clean lukewarm water. Do not push it back in. Exposed tissue dries and dies quickly, and the window for a simple repair is short.
Now
Unable to right itself when gently turned overGo now. Loss of the righting reflex signals a neurological or metabolic crisis.
Now
A burn, or a blackened patch on the belly or sideGo now, and unplug the heat source before you leave. Contact burns from an unregulated mat or an unguarded lamp are among the most common injuries in captive reptiles.
Now
Tremors, twitching, jerky limbs, or a rubbery jawGo now. Note your UVB bulb type and when it was last replaced. Almost always a calcium and D3 problem, and almost always a UVB problem underneath that.
Now

Today

Retained shed over the eyes, or a ring of stuck shed on the tail or a toeRaise humidity and offer a damp hide, then call if it is not clear within a day. A constricting ring cuts off circulation and the digit or tail tip is lost.
Today
Sudden weight loss, or a visibly sunken or triangular body shapeCall today, with the weight history. A reptile that has lost condition has usually been unwell for a while.
Today

Soon

Refusing food beyond the species' normal fastCheck what a normal fast looks like for this species before worrying: for several snakes it is weeks, not days. Then log it and book if the fast is unusual for this animal. Feeding anxiety drives more unnecessary vet visits than any other reptile question, and also masks the fasts that genuinely matter.
Check the guide first

Before any non-emergency call, write down the four numbers a vet will ask for: the thermostat probe reading, the warm-end air temperature, the cool-end air temperature, and the hottest accessible surface. Surface temperature can run well above the air above it.

This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it, and the time to find one is before you need one.

Bedding and substrate

5 safe, 3 with a caveat, 4 to avoid

Substrate choice follows the animal's natural humidity, not the look of the vivarium. Get that pairing right and most substrate arguments disappear.

Safe

Topsoil and coco fibre mixThe usual bioactive-ready base for lizards from humid habitats. Plain topsoil with no fertiliser, no perlite and no wetting agents; keep the lower layers slightly damp. Coco fibre on its own also holds humidity, but rinse it and do not let it go bone dry, which makes it dusty.
safe
Leaf litter over a soil baseCover, humidity and invertebrate habitat in one. Sterilised, from a known source.
safe
Cypress mulch or orchid barkLong-lasting, holds humidity and resists compaction. Cypress specifically, not general 'wood mulch'.
safe
Topsoil and play sand mix, for species from dry habitatsPacks firm and holds a burrow. Plain topsoil with no fertiliser, no perlite and no wetting agents.
safe
Paper towel or newspaperNot attractive, but correct for quarantine, for a new arrival, and for any animal being monitored for output.
safe

With a caveat

Reptile carpetSnags claws and traps bacteria in the fibres. If used, it needs replacing rather than washing, often.
with a caveat
Sand alone for desert speciesReal desert is packed substrate, not loose play sand. Mix it with soil so it holds a burrow.
with a caveat
Bioactive setupsExcellent when established, but the clean-up crew needs weeks to establish before the animal goes in.
with a caveat

Never

Calcium sand and 'digestible' sandsMarketed as safe to eat, which encourages eating it. Implicated in impaction.
never
Crushed walnut shellSharp fragments, frequently implicated in impaction, with no advantage over soil.
never
Pine and cedarThe same aromatic oils that make them unsafe in small-mammal bedding. They have hardly been studied in reptiles, so leave them out.
never
Uncovered heat mats and unguarded ceramic emittersNot a substrate, but the most common cause of contact burns. Every heat source needs a thermostat, and every emitter needs a guard.
never

This is our general list for reptiles. We have not built one specific to Water Dragons yet.

Impaction is far more often a temperature problem than a substrate problem: an animal that cannot reach its digestive temperature will not pass what it swallows, whatever it is standing on.

Top resources for more info

Independent creators and organisations we would send a friend to. We have no affiliation with any of them, and nothing here is sponsored. Links checked 2026-10-22.

YouTubers

Reptiles and ResearchEvidence-led husbandry: enclosure size, UVB, thermal gradients, enrichmentClint's ReptilesWhich reptile suits you, with honest care and handling verdictsGoHerpingBeginner reptile care, setup mistakes and welfare basics

Sites

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Is your enclosure big enough?

These are the smallest sizes that give good conditions, not legal minimums. More room is always better.

Minimum 27 sq ft of floor · 7 x 4 x 6 ft

Every figure, and where it comes from

Specialist care sheets give 6 x 3 x 6 ft as the minimum for one adult, and no welfare-led source found asks for more floor. Austrian law asks for 27 sq ft of floor for one or two adults, so this figure is set just above it, because good conditions are never less than a law requires.

Minimum floor area27 sq ft of continuous, unbroken floor
As dimensions7 x 4 x 6 ft
Height6 ft minimum. This species climbs, so height is not optional.
CompanyMust be housed alone. Solitary safest; never two males
The recognised standards do not agree on this one
ReptiFiles: 6 x 3 x 6 ft for one adult. Its minimum, with larger strongly recommended. The height this site uses. Checked 2026-10-23.
LICG, the Dutch information centre for companion animals: 6.5 x 3.3 x 5 ft (width x depth x height) for a group of two or three. Its recommendation for a small group. Less floor than the figure used here. Checked 2026-10-23.
Austrian legal minimum (2. Tierhaltungsverordnung, Anlage 3): 27 sq ft of floor and 6 ft of height for one or two adults. A legal minimum, recorded for context. The floor used here, 27 sq ft, is set just above it. Checked 2026-10-23.
Switzerland, Tierschutzverordnung (legal minimum): 5 x 3 head-body lengths of land, a pool of 2 x 2 and 1 deep, and 5 of height, for up to two. A legal minimum, recorded for context. The figure used here meets it for a dragon of up to 12 in head-body length. Checked 2026-10-23.

What it really costs

Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.

Can a Chinese Water Dragon eat that?

Primarily an insectivore with an occasional vertebrate meal: closer to a monitor's menu than a bearded dragon's salad.

The full list: 30 foods

Never (16)

AlcoholNo safe amount at any body weight on this site.
never
AvocadoPersin. Toxic to birds and many mammals; it has not been studied in reptiles, so treat it as unsafe.
never
CaffeineCoffee, tea and energy drinks. Cardiac and neurological toxicity at tiny doses for an animal this size.
never
ChocolateTheobromine and caffeine. Small mammals and reptiles cannot clear either.
never
CitrusAcidic enough to upset the gut, and sugary. Not worth the risk.
never
Dog or cat foodFormulated for a mammal, and not food for an insect-eater.
never
FirefliesLucibufagins. A single firefly has killed adult lizards. This is the most dangerous item on any reptile list and it is the one keepers do not know about.
never
Fish caught from the wildParasites and pollutants. Separately, thiaminase depends on the fish species, not where it was caught: goldfish, carp, many minnows and smelt carry it even when shop-bought, and cause vitamin B1 deficiency if fed regularly.
never
GarlicSame allium toxicity as onion, and more concentrated by weight.
never
Insects larger than the gap between the eyesOversized prey risks impaction and is often refused. Size the feeder to the animal, every time.
never
LeekAllium family. Same mechanism as onion and garlic.
never
OnionOrganosulphur compounds damage red blood cells. The whole allium family is out.
never
RhubarbOxalate load high enough to cause acute kidney injury.
never
Salty or seasoned human foodSalt, oil and seasoning. Crisps, chips, seasoned leftovers and processed meat are all out.
never
VegetablesNot food for an insect-eater: it will not eat it, and it does it no good. Use greens to gut-load its feeders instead.
never
Wild-caught insectsPesticide residue and parasites, and the identification risk. Captive-bred feeders only.
never

Rare treats (5)

Feeder fishOffer only sparingly: feeder fish bring parasites, and many, goldfish and rosy red minnows among them, carry thiaminase, which destroys vitamin B1. Rarely.
rare treat
FruitA little finely chopped fruit is sometimes eaten; sugar is not what this insectivore needs. A small piece, rarely.
rare treat
Pinky or fuzzy micePre-killed, for adults, as a rich treat rather than a staple. Now and then, adults only.
rare treat
SuperwormsFatty. An occasional extra for a larger lizard, not part of the rotation. One or two, rarely.
rare treat
WaxwormsVery fatty. Useful for an underweight animal or for medicating, addictive otherwise. One or two, rarely.
rare treat

Occasional (3)

HornwormsHigh in water; useful for hydration and variety. One or two, in rotation.
occasional
Leafy greensA little finely chopped greens is sometimes eaten, but plant matter is a minor part of the diet, unlike in a bearded dragon. A small amount, now and then.
occasional
MealwormsHard chitin shell and a poor calcium ratio. Fine as part of a varied feed, poor as the whole diet. A few, alongside better feeders.
occasional

Everyday foods (6)

Black soldier fly larvaeUnusually high in calcium; one of the few feeders that does not need dusting. Several per feed.
everyday food
CricketsA standard feeder. Gut-load them for 24 hours before offering, or you are feeding an empty shell. Sized no wider than the space between the animal's eyes.
everyday food
Dubia roachesBetter calcium ratio and more meat per insect than crickets, and they cannot climb glass. Sized to the animal.
everyday food
EarthwormsA good part of the rotation, alongside roaches, crickets and locusts. A few per feed.
everyday food
LocustsA meaty feeder that climbs and draws a strong hunting response. Sized no wider than the space between the animal's eyes.
everyday food
SilkwormsSoft-bodied, lower in fat than most worms, and readily taken. A few per feed, in rotation.
everyday food

That food is not on our list. An insect-eater's diet is live, gut-loaded insects, so if it is not a captive-bred feeder of the right size, leave it out and check the species guide.

Dust feeders with plain calcium at most feedings and with D3 and a multivitamin on the schedule in the species guide; too little and too much both cause harm.