
Source: Wikimedia Commons
Phelsuma grandis
One of the largest day geckos, bright green with red markings. It reaches 23-28 cm in total length and is active throughout the day. It needs strong UVB and a warm basking spot, and males fight fiercely, so it is kept singly or in pairs.
Phelsuma grandis is a diurnal, arboreal gecko of the family Gekkonidae found in tropical and subtropical forest in northern and north-western Madagascar. It reaches 23 to 28 cm in total length, making it one of the largest living day geckos. The body is bright green, rarely bluish green, with a red stripe running from the nostril to the eye and red dots or bars on the back. The red markings vary greatly and are absent in some animals, but the nostril-to-eye stripe is always present. Adults may show conspicuous white sacs on the neck that store calcium, best developed in females. Captive care calls for a tall enclosure, strong UVB and a basking spot of 29 to 32 degrees C, with humidity around 40 to 75 per cent. Males fight fiercely and the subordinate animal can be badly injured, so they must never be housed together. The skin is thin and tears easily, so handling is best avoided in favour of interaction at feeding time. The species has established introduced populations on Reunion, in Florida and in Hawaii.
Source: Wikipedia (CC BY-SA 4.0)
The Giant Day Gecko lives 15-20 years.
The Giant Day Gecko grows to 23-28cm total length, females generally smaller.
Origin
Northern and north-western Madagascar, including Nosy Komba; introduced to Reunion, Florida and Hawaii
Lifespan
15-20 years
Size
23-28cm total length, females generally smaller
Sources: ReptiFiles: Giant Day Gecko Care Sheet / Reptiles Magazine: Three Day Geckos From Madagascar / Wikipedia (English) / Reptile Database
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Phelsuma grandis Gray, 1870
Synonyms: Phelsuma madagascariensis grandis Gray, 1870, Phelsuma madagascariensis venusta Mertens, 1964, Phelsuma madagascariensis notissima Mertens, 1970
Authority databases: GBIF · Reptile Database
Nomenclature follows global taxonomic authority databases.
Phelsuma spp. has been listed under Appendix II since February 4, 1977 (current listing effective February 1, 2017). Because it is listed under Appendix II, no registration certificate as an internationally rare wild animal or plant species is required; however, an export permit issued by the exporting country is required for importation. It is neither listed as a specified animal under the Ordinance for the Enforcement of the Act on the Welfare and Management of Animals, nor designated as a specified alien species under the Invasive Species Act.
Sources: CITES Appendices (Phelsuma spp., Appendix II) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Humidity
40〜75%
Crickets and dubia roaches, prepared fruit-based gecko diet, nectar
Keep the basking area at 29-32C, the cool zone at 25-28C and night-time temperatures at 23-25C. Aim for average humidity of 40-75 per cent, maintained by misting morning and evening. As a diurnal species it requires UVB, with a target UV index of 3.0-4.0 at the basking site.
It is arboreal and uses height, so a tall enclosure of at least 60 x 60 x 120 cm is recommended even for one animal. Combine bamboo, thick driftwood and live plants to provide climbing routes and cover. Day geckos climb upside down on mesh tops and can burn themselves, so suspend heat lamps clear of the enclosure.
It is an omnivore taking both insects and fruit, feeding in the wild on invertebrates, very small vertebrates and nectar. In captivity use a prepared fruit-based gecko diet as the base and offer crickets or dubia roaches two or three times a week, dusting feeders with calcium.
Males fight fiercely and will attack a subordinate animal until it is badly injured or killed, so they must not be housed together. Keep them as a breeding pair or as a group of females only. They are fast and their skin is delicate, so they are not suited to handling.
It belongs to Phelsuma, listed on CITES Appendix II, so import requires an export permit from the exporting country; Appendix II animals need no Japanese registration certificate. The species shows temperature-dependent sex determination, with incubation temperature shifting the sex ratio. It has established introduced populations in Florida and on Reunion, so animals must never be released. Until 2007 this gecko was treated as a subspecies of the Madagascar day gecko (Phelsuma madagascariensis) under the name P. madagascariensis grandis, so older literature and trade labels still mix the two. They are now separate species, so confirm the scientific name when acquiring one.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The average lifespan of Giant Day Gecko is 15-20 years. With proper care and nutrition, they can live a long and healthy life.
Giant Day Gecko typically reaches 23-28cm total length, females generally smaller as an adult. Size may vary depending on care conditions and individual genetics.
Giant Day Gecko feeds on: Crickets and dubia roaches, prepared fruit-based gecko diet, nectar. Aim for a balanced diet with appropriate feeding frequency.
The price of Giant Day Gecko varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 16, 2026