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Atlas / Library / Gekkonidae / Giant Day Gecko
CITES II
Gekkonidae

Giant Day Gecko

Phelsuma grandis

Traceable. The figures above appear in the page we cite, which we opened on 10 Aug 2026. That means you can check them, not that we have confirmed they are right. reptifiles.com

Photograph: Marius Burger · CC0

Photographed by an observer on iNaturalist and published under a Creative Commons licence; the photographer and the licence are named under the image. It is not an animal of ours, and no animal was handled by us to produce it.

14:00
Day

Drag the sun. The sheet states a night temperature, so the rail follows it.

CITES II is a global listing and holds in every country. National law is not global, and we hold no national wildlife law for any country, Thailand included. Check your own authority before buying or selling.

Check your setup against this sheet I keep one 123 plants usable with this species
Back to the globe My keep

https://keepr.pet/husbandry/en/phelsuma-grandis

‹ All husbandry guides
warm end29–32 °C
cool end25–28 °C
Humidity40–75 %
Enclosure60×60×120
Diet2–4 days

The numbers

Thermal gradient

152025303540 °C
25–28°Cool side
29–32°Warm side
23–25°Night

Day: a real gradient, 29–32°C warm against 25–28°C cool, so the animal chooses. Night: 23–25°C.

Why

Same scale on every sheet here, so two species compare by eye.

The sheet stateswarm 29-32 °C / cool 25-28 °C / night 23-25 °C

Humidity

40–75%Target RH

The sheet states40-75%

UVB

T5 6%UVI 3–4

The sheet statesUVI of 3.0-4.0 in the basking area; Arcadia ShadeDweller Arboreal kit — 4-6″ / 10-15cm; Arcadia Forest 6% UVB kit — 7-9″ / 17-23cm; Zoo Med T5 HO Reptisun 5.0 — 7-9″ / 17-23cm

Identity

Origin

Enclosure and conditions

Enclosure

60 cm120 cm
warm sideUVB tube
50100150200 cm
60 × 60 × 120 cmWidth × depth × height
36dm² of floor
Substrate: not in our dataWater: not in our dataHides: not in our data

Drawn from the stated numbers. Only what the sheet states is drawn inside.

Why

The rectangle carries the exact width-to-height ratio of the figures above it, and the ruler under it places that width on the 0–250 cm scale every sheet here shares, so two species still compare at a glance. Nothing is added that the sheet does not name: a lamp drawn on a sheet that never mentions one would be invented equipment. What the sheet leaves out is listed rather than left blank, because an empty tank reads as « none needed ».

The sheet statesminimum recommended enclosure size for a single giant day gecko is 24"L x 24"W x 48"H / 60 x 60 x 120 cm

Temperature
warm 29–32 °C / cool 25–28 °C / night 23–25 °C
Humidity
40–75%

What your climate adds

This sheet states a range to hold. Your local climate decides how much work holding it is. Pick the nearest city: nothing is sent anywhere, the choice stays in this browser.

Diet

Feeding rhythm

Juvenile
every 1 d
Adult
every 2.3–3.5 d
12Meals in 28 days · adult

Twenty-eight days, one row. Each band is a meal window. This sheet states a figure for each age, so each age has its row.

Why

The windows widen as they go because the interval is a range: four meals after a 10–14 day cycle land anywhere between day 40 and day 56. A young animal's row is drawn only where the sheet gives one: working it out by dividing the adult interval would be inventing a ration.

The sheet statesJuveniles (0-6 months) — insects daily, CGD every other day; Subadults and Adults (>6 months) — insects 2-3x/week, CGD 1x/week; crickets, dubia roaches, discoid roaches, red runner roaches, red head roaches, grasshoppers/locusts, hornworms, silkworms

Good to know

  • A diurnal gecko that laps nectar and fruit like a tiny sunbird.

Common questions

Does it bite?

An adult male can, and it is sharp enough to break skin. They are bold rather than shy.

How big does it get?

Up to about 25 to 30 centimetres, the largest of the day geckos.

Can I handle it?

Not really. The skin is delicate and they move fast. Treat it as a display animal.

Can I keep two together?

Never two males. Even a pair needs a large planted enclosure and watching for bullying.

What it needs

Enclosure at least 60 × 60 × 120 cmbecause enclosure — minimum recommended enclosure size for a single giant day gecko is 24"L x 24"W x 48"H / 60 x 60 x 120 cm
A heat sourcebecause temp — warm 29-32 °C / cool 25-28 °C / night 23-25 °C
A thermostat to regulate itbecause temp — warm 29-32 °C / cool 25-28 °C / night 23-25 °C
A thermometerbecause temp — warm 29-32 °C / cool 25-28 °C / night 23-25 °C
A way to check the night figurebecause temp — warm 29-32 °C / cool 25-28 °C / night 23-25 °C
A hygrometerbecause humidity — 40-75%
UVB 6-6% (T5), stated as requiredbecause uvb — UVI of 3.0-4.0 in the basking area; Arcadia ShadeDweller Arboreal kit - 4-6″ / 10-15cm; Arcadia Forest 6% UVB kit - 7-9″ / 17-23cm; Zoo Med T5 HO Reptisun 5.0 - 7-9″ / 17-23cm

Every line above is deduced from a value this sheet states, and names which one. Nothing here is a general recommendation.

Sources

reptifiles.com — lu le 2026-08-04thebiodude.com — lu le 2026-08-04speciesplus.net — lu le 2026-08-08gbif.org — lu le 2026-08-08

Others in this group

Leopard GeckoEublepharis maculariusCrested GeckoCorrelophus ciliatusGargoyle GeckoRhacodactylus auriculatusAfrican Fat-tailed GeckoHemitheconyx caudicinctusTokay GeckoGekko geckoGolden geckoGekko badeniiLeachieRhacodactylus leachianusChahoua gecko (mossy prehensile-tail)Mniarogekko chahoua

What this sheet states

77%
TemperatureHumidityEnclosure sizeActivityOriginDietSourcesUVB

This sheet states 5 of 7 of the fields this product runs on. What is missing turns something off: day/night engine and awake count on the globe, the diet section. We show the gap rather than fill it with a plausible number.

UVB is measured but does not count: it is absent from 421 of 678 sheets, and on most of them that is not a gap, since a nocturnal snake's sheet has no reason to state a UV index. Counting it would call the library incomplete without cause.