Giant Day Gecko

Overview

Unlike most geckos, day geckos are active in daylight ². The giant day gecko is emerald green with yellow and blue tones along the sides and red spots ¹. It is fast, alert and best enjoyed as a display animal. Expect up to 15 years in zoos and up to 20 in private care ¹².

Natural history

Giant day geckos come from northern and eastern Madagascar ¹²³, where they live mainly in rainforest canopy and coconut palms, and also around people ¹². Introduced populations now exist on nearby islands, in Hawaii and in the Florida Keys. In Mauritius they have displaced native day geckos ². In the wild they eat mostly insects and other arthropods, plus sweet fruit, nectar and honey ¹².

Enclosure

The EXOPET guidance, written by Leipzig University's veterinary faculty for German authorities, recommends ¹:

• Size. At least 6 × 6 × 8 times the gecko's snout-to-vent length (L × W × H) for a pair. That is about 90 × 90 × 120 cm (35 × 35 × 47 in) for a gecko with a 15 cm body. Its expert recommendation for one or two animals is 100 × 60 × 120 cm (about 40 × 24 × 47 in). Add 15% floor area for each extra animal.
• Climbing. Vertical climbing routes and horizontal resting places: roots, vines, branches.
• Hiding. Hollow bamboo and cork tubes. Line two or three walls with cork or similar.
• Company. Keep singly, as a pair, or one male with several females. Males will not tolerate each other.

Temperature & lighting

Day geckos need bright light with plenty of UV for 10 to 14 hours a day, from a heat lamp that emits both UVA and UVB ¹. Guard every lamp so the gecko cannot touch it and get burned ¹.

Humidity

Keep relative humidity around 70% by day, rising to 80% at night ¹.

Substrate

Use terrarium soil, coconut fiber, bark mulch or a soil–peat mix, kept slightly damp but not wet ¹. Add a shallow water dish and refresh it daily ¹.

Diet & supplementation

• Insects. Live insects such as crickets or fruit flies, dusted with mineral and vitamin supplements ¹.
• Fruit. Sweet fruit, fruit purée or a commercial day gecko food containing pollen ¹.
• Water. Fresh, clean water every day ¹.

Handling & temperament

Treat a day gecko as a display animal and plan on watching rather than holding.

Check the gecko's health every day, keep the enclosure clean, remove leftover food and droppings promptly, and wash your hands before and after contact. Reptiles commonly carry Salmonella ¹⁵.

Health

Common issues

• Metabolic bone disease when UV lighting or supplementation is lacking ¹.
• Burns from unguarded lamps ¹.
• Fighting between males ¹.

When to see a vet

Have a reptile-experienced vet check anything unusual ¹. Appetite loss lasting more than a week, noisy breathing or stuck shed warrant a visit. Open-mouth breathing, limp or oddly angled limbs, large open wounds or an unresponsive animal are emergencies ⁶.

Breeding overview

Females usually lay two eggs several times a year and hold them with their hind legs for a few hours while the shells harden ². Mature females often show calcium deposits on each side of the neck ².

Legal & ethics

All Phelsuma day geckos, including P. grandis, are listed on CITES Appendix II, so international trade requires permits ⁴. Never release a pet day gecko: introduced populations have harmed native geckos on other islands ².

Sources

1. Informationen zur Haltung von Reptilien: Großer Madagaskar Taggecko (EXOPET) · Brandenburg Ministry of Agriculture, Environment & Consumer Protection / Leipzig University Veterinary Faculty
2. Madagascar giant day gecko · Smithsonian's National Zoo and Conservation Biology Institute
3. Phelsuma grandis · The Reptile Database
4. CITES listing: Phelsuma grandis · Species+ (UNEP-WCMC and CITES Secretariat)
5. Salmonella, Feeder Rodents, and Pet Reptiles and Amphibians · U.S. Food and Drug Administration
6. When Should My Reptile See a Veterinarian? · Tree of Life Exotic Pet Medical Center

Last reviewed 2026-10-24 by Novel Fauna. This guide is general husbandry information, not veterinary advice. When an animal is sick, see a veterinarian experienced with exotic animals.

Revision history

1. 2026-10-24 Library: fix source frontmatter, hognose difficulty, fallback guide links, hero copy a22966a
2. 2026-10-24 Library: 50 cited care guides, /library/[slug] route, coming-soon cards, SLUGS.txt synced to species.guide_slug 228ce54
3. 2026-10-24 WIP: library guides (lizards) 478b100

Evidence grades: Novel Fauna editorial: source classification, not yet expert-reviewed, 2026-10-25. What the grades mean.

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