Giant Day Gecko: Characteristics, Behavior, Diet, Care, As Pet

The Giant Day Gecko (Phelsuma grandis), also known as the Madagascar Giant Day Gecko, is a fascinating and colorful species that has captivated reptile enthusiasts worldwide.

This species is native to the northern parts of Madagascar and has successfully established populations in several other regions due to their adaptability and generalist habits. The Giant Day Gecko is known for its vibrant green color, large size, and distinctive red markings on its back, which make it a unique and visually striking pet.

In their native habitat, these geckos are found in tropical forests, where they spend most of their time in trees, taking advantage of the plentiful insect and fruit resources. They have also been known to inhabit human-made structures, reflecting their ability to thrive in various environments.

These fascinating creatures are known for their striking appearance, characterized by a bright green, and occasionally, bluish-green body color, with red or orange spots or bars on their back. These markings can be variable and in some cases, even completely absent.

Physical Characteristics

Giant Day Gecko

The Giant Day Gecko, as the name suggests, is one of the larger species within the Day Gecko family. Their striking physical appearance is arguably their most captivating attribute. They boast a bright green or, rarely, bluish-green body, which serves as a stark contrast to the red or orange spots or bars that typically adorn their back.

These markings are variable, meaning that they can differ greatly from one individual to another. In some cases, these distinctive markings may even be completely absent. This variability in coloration and patterning contributes to their charm and uniqueness.

An interesting feature that sets the Madagascar Giant Day Gecko apart from many other gecko species is the red stripe that extends from the nostril to the eye. This feature, coupled with their vibrant body color, not only makes them a favorite among reptile enthusiasts but also a sight to behold in their natural habitat.

Giant Day Gecko Size

In terms of size, the Giant Day Gecko is a mid-sized lizard. Males can reach lengths of up to 10 inches from snout to tail, while females are usually slightly smaller. Their size, coupled with their bright coloration, makes them a standout among many other gecko species.

As for their growth rate, Giant Day Geckos, like most reptiles, grow more rapidly in their early stages of development. During this time, they can shed their skin almost weekly as a part of their growth process. As they mature, their growth rate slows, and they typically shed their skin once a month.

This shedding process is an essential part of their growth and development, as it allows them to replace old, worn-out skin with new, healthy skin. It’s important to note that the growth rate can vary depending on factors such as diet, habitat, and overall health.

Behavior and Lifestyle

Giant Day Geckos, much like other members of the Phelsuma genus, are diurnal in nature. This means that they are active during the day and sleep at night. Their daytime activity sets them apart from many other gecko species that are primarily nocturnal.

Being diurnal, they spend their waking hours foraging for food, basking in the sunlight, and engaging in various social interactions. This behavior, coupled with their vibrant coloration, makes them very visible and intriguing to observe both in the wild and in captivity.

Giant Day Gecko

Climbing Abilities and Territorial Behavior

Being arboreal creatures, Giant Day Geckos are excellent climbers. They are equipped with special adhesive pads on their feet, which enable them to navigate vertical surfaces with ease. This feature allows them to inhabit a variety of environments, ranging from tree trunks to human-made structures.

In terms of their social behavior, Giant Day Geckos exhibit a degree of territoriality, particularly among males. Males can be territorial towards other males and should be kept separate to avoid conflict. However, it’s worth noting that even male-female pairs and females can exhibit aggressive behavior and may need to be housed separately.

Shedding Frequency and Its Significance

Shedding skin is a normal and essential process for Giant Day Geckos, as it is for all reptiles. It allows them to grow and replace old, worn-out skin with new, healthy skin. Younger geckos in their growth phase shed their skin almost weekly, while more mature geckos typically shed once a month.

Shedding is usually a smooth process, but if a gecko struggles to shed, it may indicate an issue with their habitat’s humidity levels or its overall health.

Giant Day Gecko Lifespan

The lifespan of a Giant Day Gecko can vary greatly based on factors such as their diet, habitat, and overall health. On average, they can live anywhere between 8 to 20 years. As such, prospective owners should prepare for a long-term commitment when deciding to care for a Giant Day Gecko.

Are Giant Day Geckos aggressive?

Giant Day Geckos, like many reptile species, can display territorial behavior, particularly among males. Males can be aggressive towards each other and should generally be housed separately to avoid conflict. Even male-female pairs and females can become violent under certain circumstances and might require separate habitats.

However, it’s important to note that aggression is typically directed towards other geckos, not humans. When interacting with humans, they are more likely to exhibit defensive behaviors such as tail-dropping or attempting to flee if they feel threatened. While they can bite if they feel threatened or cornered, they are not typically aggressive towards people.

In terms of handling, they are not the best choice. They are delicate creatures and do not generally appreciate being handled, which can cause them stress. Their skin is fragile and can be easily damaged.

Remember, each gecko is an individual and may display different behaviors. A well-cared-for gecko that feels secure in its environment will generally be less stressed and therefore less likely to show aggressive or defensive behaviors.

Giant Day Gecko Price

The price of a Giant Day Gecko can vary depending on factors such as age, color variation, and the breeder or pet store where you purchase it. Generally, you can expect to pay anywhere between $40 to $150 for a Giant Day Gecko. Keep in mind that the cost of the gecko itself is just one aspect of the overall expense.

You will also need to invest in a suitable enclosure, lighting, heating, and other supplies to create a proper environment for your gecko. Additionally, ongoing costs such as food and potential veterinary care should be considered when calculating the total cost of owning a Giant Day Gecko.

Giant Day Gecko Diet

Like most geckos, Giant Day Geckos are primarily insectivorous, meaning their diet mainly consists of insects. This includes a variety of feeder insects like crickets, mealworms, waxworms, and more. They can consume either brown, black, or banded crickets, which can make up most of the insect matter in their diet.

This variety is essential to providing a balanced and nutritionally complete diet, as different insects offer different nutritional profiles.

In addition to insects, Giant Day Geckos also eat fruit, making them omnivorous to some extent. They appreciate soft, ripe fruits like bananas, peaches, or mangos. Some may also accept commercially available gecko diets that include both insect and fruit components.

Importance of Gut-loading Feeder Insects

Gut-loading is the practice of feeding nutritious food to feeder insects before they are given to the gecko. The nutrients from this food are then passed on to the gecko when it consumes the insect. Gut-loading is important because it enhances the nutritional value of the insects and, therefore, improves the gecko’s diet.

This practice is especially important for insectivorous animals like Giant Day Geckos, as it helps to ensure they receive a well-rounded intake of essential vitamins and minerals.

Feeder insects should be gut-loaded 24 to 48 hours before being placed in the gecko’s enclosure. The food for gut-loading can include a variety of fruits, vegetables, and grains, which provide a range of nutrients to insects. This, in turn, maximizes the nutritional benefits for the gecko when it consumes the insects.

Giant Day Geckos as Pets

Giant Day Geckos can make stunning and engaging pets due to their vivid colors, active lifestyle, and impressive size. They are diurnal animals, meaning they are active during the day, making observing their behavior easier than

Giant Day Gecko

However, prospective owners should be aware that these geckos are considered one of the more difficult gecko species to care for. They require a precise environment, a varied diet, and careful handling to ensure they thrive.

Moreover, Giant Day Geckos can live anywhere between 8 and 20 years. This means that adopting one of these animals is a long-term commitment, which prospective owners should be prepared for. If well cared for, these geckos can provide a fascinating insight into the world of reptiles for many years.

Giant Day Gecko Tank Size

For a single Giant Day Gecko, the enclosure should measure no smaller than 18 inches long, 18 inches wide, and 24 inches tall. This size provides enough space for the gecko to move around and exhibit natural behaviors.

If you plan on keeping a pair or a small group of geckos, the size of the enclosure should be increased accordingly. Larger enclosures are generally better, as they allow for more robust environmental enrichment and increase the geckos’ overall well-being.

Interaction with Humans

Madagascar Giant Day Geckos are known to be territorial, especially males towards other males. Even in male-female pairs, aggression can occur, and often individuals will need to be kept in separate habitats to avoid conflict.

When it comes to human interaction, Giant Day Geckos can be skittish and are generally not keen on being handled. Their skin is fragile and can tear easily if they are gripped too tightly, which makes handling them a delicate process.

Furthermore, like many geckos, they have the ability to drop their tails as a defense mechanism, which can happen if they feel threatened during handling. Because of these factors, interaction with Giant Day Geckos is often more about observation and less about physical contact.

Is a Giant Day Gecko a good pet for Beginners?

Giant Day Geckos can make fascinating and visually striking pets due to their vibrant colors, diurnal habits, and active nature. They can provide a lot of enjoyment for those who appreciate observing reptile behavior.

However, their care can be challenging and is not typically recommended for beginners. They require a carefully maintained habitat with proper temperature, humidity, and lighting. Their diet consists mainly of live insects, which also need to be cared for and gut-loaded for optimal nutrition.

Moreover, while they are beautiful to observe, they are not a pet that enjoys handling. Their skin is highly delicate and can be damaged easily. These geckos are also known for their ability to drop their tails when stressed or threatened, a consideration for potential owners.

So, while they can indeed be good pets, they’re best suited for owners who are experienced with reptile care or are willing to invest the time and effort required to learn and meet their specific needs.

Giant Day Gecko Care

Giant Day Gecko Care is a complex task that requires a deep understanding of their needs and behaviors. They are primarily insectivorous, feeding on a variety of insects like crickets. It’s essential to gut-load these feeder insects 24 to 48 hours before offering them to the gecko.

Gut-loading is the process of feeding nutritious food to the insects, which is then passed onto the gecko, ensuring they get the most nutritional value from their meals.

Madagascar Giant Day Gecko Habitat Setup

The habitat for a Giant Day Gecko should be vertically oriented, mimicking the tall trees and foliage found in their natural habitat. The enclosure should include multiple climbing surfaces and hiding spots, such as branches, vines, and live or artificial plants. This setup allows them to exhibit natural climbing behaviors and provides them with a sense of security.

Handling these geckos requires caution due to their fragile skin. They are not generally comfortable with handling, and any necessary handling should be done gently, with minimal restriction to avoid causing stress or injury. It’s also important to never grab a gecko by its tail, as it can detach as a defense mechanism.

Giant Day Gecko Humidity

Humidity is a crucial factor in the health and well-being of a Giant Day Gecko. These geckos come from tropical habitats and require high humidity levels to thrive. The enclosure’s humidity should be maintained between 50 to 70%, which can be achieved by misting the enclosure daily.

In addition to maintaining appropriate humidity levels, misting also provides droplets for the gecko to drink from, replicating the way they consume water in the wild.

Regular Vet Check-ups and Potential Health Issues

Regular veterinary check-ups are vital to ensure the health of a Giant Day Gecko. A qualified reptile veterinarian can monitor the gecko’s growth, weight, and general health, and provide preventative care and early treatment for potential health issues.

Common health problems in Giant Day Geckos include metabolic bone disease due to insufficient UVB exposure or calcium intake, skin infections or parasites, and issues related to incorrect humidity, such as dehydration or respiratory problems.

Regular fecal checks can also help identify and treat any potential parasitic infections. Being aware of these potential health problems and their symptoms, along with regular vet check-ups, can help ensure that your Giant Day Gecko remains healthy and thriving for many years.


What kind of lighting setup is recommended for Giant Day Geckos?

Giant Day Geckos are diurnal creatures and require an appropriate lighting setup that mimics their natural environment. They need a UVB light to help them synthesize Vitamin D3, which is essential for calcium absorption and bone health. A basking light should also be provided to create a thermal gradient in their enclosure, allowing them to regulate their body temperature.

The basking area should reach a temperature of around 90-95°F (32-35°C), while the cooler area should be around 75-80°F (24-27°C). Make sure to turn off the lights at night to mimic a natural day-night cycle.

How do I know if my Giant Day Gecko is stressed or unwell?

Signs of stress or illness in Giant Day Geckos may include lethargy, loss of appetite, rapid weight loss, irregular shedding, or abnormal feces. They might also exhibit unusual behaviors, such as hiding excessively, decreased activity, or excessive aggression.

If you notice any of these signs, it’s crucial to consult with a reptile veterinarian to determine the cause and appropriate treatment.

Can Giant Day Geckos cohabit with other reptile species?

It is not recommended to house Giant Day Geckos with other reptile species. Mixing species can lead to stress, competition for resources, and even aggression between the animals. Additionally, different species may have different environmental and dietary requirements, making it challenging to provide optimal care for both.

It is best to house Giant Day Geckos separately or with others of their species, following proper sex and space guidelines.

How can I encourage natural behaviors in my Giant Day Gecko’s enclosure?

To encourage natural behaviors, provide your Giant Day Gecko with an environment that closely resembles their natural habitat. This includes providing plenty of climbing opportunities, such as branches, vines, and cork bark, as well as live plants for hiding and resting.

Providing a range of hiding spots and maintaining proper temperature and humidity levels will also help your gecko feel secure and reduce stress. Ensure that their enclosure has enough space and complexity to allow them to explore, climb, and exhibit their natural behaviors.

How do I handle a Giant Day Gecko safely, if necessary?

Handling should generally be kept to a minimum, as Giant Day Geckos are delicate and can be easily stressed or injured. However, if you need to handle your gecko, approach it calmly and gently. Use both hands to scoop up the gecko, supporting its entire body, rather than grabbing or pinching it.

Avoid holding it tightly or pulling on its tail, as this can cause injury or tail dropping. Remember that Giant Day Geckos can be quick and agile, so be prepared for sudden movements. After handling, wash your hands to remove any potential irritants or bacteria.


In conclusion, Giant Day Geckos (Phelsuma grandis) are fascinating and visually stunning creatures that can make interesting pets for experienced reptile enthusiasts. However, they require specialized care, including a proper diet, habitat setup, and specific temperature and humidity levels.

They are delicate animals and should be handled minimally to avoid causing stress or injury. As potential pet owners, it’s crucial to understand the long-term commitment and responsibility involved in caring for a Giant Day Gecko.

With proper care and attention, these vibrant geckos can thrive in captivity and provide years of enjoyment and observation for their caretakers.

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