Marginated tortoise (Testudo marginata) – the largest land tortoise in Europe
The marginated tortoise (Testudo marginata) belongs to the family Testudinidae, a group of tortoises fully adapted to life on land. Species within the genus Testudo are particularly suited to relatively dry environments. They are characterized by thick, columnar limbs with fused toes and strong digging claws. Their shells are usually domed and heavy, giving them a stocky appearance, and they move at a slow, deliberate pace.
What does a marginated tortoise look like?
The marginated tortoise (Testudo marginata) has an elongated shell with a convex carapace (the upper shell) and a flat plastron (the lower shell). The carapace broadens toward the rear, forming a distinctive protruding frill that frames the shell. This frill is especially pronounced in males and is likely the origin of the species’ Latin name. The head is oval, with a narrow snout ending in a horny beak. The sharply cut nose gives the snout a square profile when viewed from the side. The neck is short and thick. The front legs are slightly flattened, while the rear legs are stout and column-like; all limbs end in four strong claws. The tail is short and pointed, typically longer and more robust in males.
The head and limbs are covered with horny scales. The carapace is primarily black, with lighter brown centers on the dorsal scutes and larger pale areas on the edges. The plastron is light brown, decorated with a black triangular pattern. Skin coloration ranges from light brown to gray or even nearly black. Juveniles are much lighter in color, but they darken as they age sometimes becoming almost entirely black (a condition known as melanism).
The marginated tortoise is the largest tortoise species in Europe. Interestingly, it is also one of the few species in which males are larger than females. On average, females reach a carapace length of 25–27 cm, while males grow to 27–32 cm. Adults typically weigh between 2 and 3.5 kilograms. It is believed that this species may have become smaller over time due to human consumption. Selective hunting favored the survival of smaller, less desirable individuals, leading to a gradual reduction in average size. Nevertheless, exceptionally large tortoises still exist. The largest living specimen, with a carapace length of 52 cm, is kept at Centro Carapax in Italy, a specialized breeding station dedicated to conserving and increasing the population of European tortoises.
Distribution and habitat
The marginated tortoise is native to southern Europe, occurring mainly in Greece, Albania, Turkey, and Italy. It inhabits rocky, dry landscapes such as maquis shrublands, olive groves, bush-covered hillsides, and mountainous terrain. The species is most often found at elevations up to 1,600 meters above sea level, though in some regions it can occur at even higher altitudes. Among tortoises of the genus Testudo, it is the best adapted to mountain environments.
In its natural range, summers are typically hot and dry, while winters are mild and humid. These seasonal contrasts strongly influence the availability of food. Mountainous habitats, in particular, bring greater fluctuations in both temperature and humidity compared to the lowlands, resulting in relatively sparse vegetation.
Lifespan of the marginated tortoise
The marginated tortoise can live for decades. In captivity, the average lifespan is around 21 years, but some individuals have been recorded to live 70 years or more. Such a wide variation is largely due to the species’ sensitivity to improper housing and diet. Before acquiring a tortoise, it is essential to ensure that you can provide the correct conditions to reduce the risk of health problems and support a long, healthy life.
Suitable terrarium for a marginated tortoise
A marginated tortoise can be housed either in a closed glass terrarium or in an open-top enclosure. Young individuals are typically kept in closed terrariums, as this allows for better control of humidity and temperature, while their small size makes it easier to provide a suitably scaled habitat. As the tortoise grows, however, it requires much more space, making a larger, open enclosure necessary.
The enclosure size should always correspond to the size of the tortoise, allowing free movement between different areas. Essential equipment such as a hide, water bowl, and shallow pool should be placed far enough apart to encourage activity and exploration. For land tortoises, the following minimum size guidelines are recommended:
- Width: at least 4 times the length of the tortoise’s carapace
- Length: at least 8 times the length of the carapace
- Height: at least 2 times the length of the carapace, ensuring the tortoise cannot reach the lighting or climb out when standing on its hind legs
If the terrarium is closed at the top, the placement of lighting must also be adjusted to maintain a safe distance from the animal.
Based on these guidelines, the minimum enclosure dimensions for a marginated tortoise with a 25 cm carapace are 200 cm in length, 100 cm in width, and 50 cm in height. However, these measurements represent only the minimum. Marginated tortoises are highly active and thrive best in the largest space possible.
Substrate for a marginated tortoise terrarium
The ideal substrate for a marginated tortoise enclosure should mimic natural conditions, retain moisture, and remain safe for the animal. The most commonly recommended option is a specialized tortoise substrate that holds humidity well without producing dust. Loose substrates can pose a risk, as they may be accidentally ingested and cause digestive blockages. To minimize this danger, a hardened substrate with a high clay content is advised. When moistened, it forms a crust that prevents accidental swallowing while still allowing natural digging behavior. A good option is Tropical Terraclay, which is specifically designed for this purpose. Alternatively, you can use a section of natural turf with vegetation. If you choose this option, ensure that the turf is completely free from pesticides or chemical treatments to keep your tortoise safe.
Every marginated tortoise enclosure should include:
- A spacious hiding place – large enough for the tortoise to enter and turn around comfortably.
- Flat stones under the heating lamp – these absorb heat during the day and release it at night, replicating natural thermal conditions.
- Low rocks in different areas – they create a varied terrain and help the tortoise wear down its claws as it moves.
- A water basin and a food bowl – both should be stable and easy for the tortoise to access.
For more detailed advice on terrarium setups and care, see the post Herbivorous Tortoises – Terrarium and Care.
Outdoor enclosure for a marginated tortoise
If you have access to a garden, building an outdoor enclosure for your marginated tortoise is highly recommended. Such an environment closely resembles the species’ natural habitat and offers more space, variety, and stimulation than any indoor setup. An outdoor enclosure encourages exercise, supports natural behaviors, and helps maintain the tortoise’s overall health and physical condition.
The enclosure should be located in a sunny spot to ensure direct exposure to natural sunlight, which is essential for vitamin D3 synthesis and healthy shell development. At the same time, the area must include shaded zones where the tortoise can cool down and rest during hot periods. A mix of lawn or meadow space combined with rocky areas creates an ideal environment that mimics the tortoise’s native terrain. Before placing your tortoise outdoors, carefully check the area for toxic or inedible plants that could pose a health risk.
Marginated tortoises are surprisingly skilled escape artists. They dig efficiently and can burrow under fences, while uneven surfaces may enable them to climb and get over barriers. They can be also easily attacked by predators. For this reason, the enclosure must be secure on all sides, including a sturdy fence sunk into the ground and walls high enough to prevent climbing. Inside the enclosure, provide a large, insulated shelter or hiding place to protect the tortoise from cold, wind, and rain. For added comfort, the roof of the shelter can be glazed, allowing it to collect solar warmth during the day and retain heat into the evening. In colder or unstable weather, the shelter may also be fitted with a heating mat or other controlled heat source to keep conditions safe and stable.
The marginated tortoise can remain in an outdoor enclosure from spring through autumn, provided that nighttime temperatures do not drop below 15°C. A warm, insulated shelter is essential, and in cases of unpredictable or highly variable weather, the tortoise should be transferred indoors for safety. Because this species is sensitive to sudden temperature fluctuations, it is always better to err on the side of caution if conditions seem unstable, keeping the tortoise indoors longer ensures its well-being.
Lighting for a marginated tortoise
The marginated tortoise is a diurnal species, active during the day and exposed to direct sunlight for most of its activity. Its dark skin and shell are adapted to absorb heat and UVB radiation more efficiently, which enables it to synthesize the proper amount of vitamin D3. This enhanced heat absorption also helps the tortoise warm up quickly after cool mountain nights. The marginated tortoise therefore requires lighting that replicates natural sunlight as closely as possible.
A variety of lighting options are available in terrarium shops. These include bulbs that emit UVB or heat radiation in addition to visible light, as well as those that combine both functions. Whether you use a single multifunction bulb or separate heating and UVB bulbs, they should always be installed at one end of the terrarium. This setup ensures your tortoise receives the full spectrum of light it needs at a single basking point. In larger terrariums, it may also be beneficial to install additional UVB lighting in the cooler zone. Sometimes an extra heating lamp is required as well to maintain proper conditions throughout the enclosure.
The power of the lighting should be chosen based on the size of the terrarium and the distance between the bulb and the tortoise. Lighting that is incorrectly selected may cause burns or, conversely, emit too little radiation, both of which negatively affect the reptile’s health. For marginated tortoises, use lighting designed for steppe reptiles with a UVB output of around 10%. Some manufacturers may use different labels, so always check that the lighting is appropriate for this species. Keep the lights on for 10–12 hours a day.
The right temperature for a marginated tortoise
In its natural environment, the marginated tortoise lives in a Mediterranean climate, with mild winters where temperatures remain above 0°C and hot, dry summers with temperatures exceeding 20°C. During summer, the maximum temperature typically reaches around 30°C. In mountainous regions, conditions are harsher, with greater temperature drops at night and in winter. Spring is very short but abundant in herbaceous vegetation. Summers are drier than in the lowlands, while autumn is long and cool.
This species is more tolerant of daily temperature fluctuations than other tortoises of its genus. Cooler nights are not a problem as long as the drop occurs gradually, just as in nature. Sun-warmed ground and rocks retain heat for many hours, allowing the tortoise to take shelter in hollows, crevices, or burrows that slow down heat loss. The coldest point of the night usually comes just before dawn, when the tortoise can already begin to take advantage of the first rays of the sun. In captivity, especially in outdoor enclosures, similar conditions should be provided so the animal can benefit from the accumulated warmth of its hiding places or, on colder nights, from a low-power heating mat.
In captivity, you should provide your tortoise with conditions similar to those in nature, but with greater stability. Exposure to extremes or sudden fluctuations can negatively affect its health. Ideally, temperatures should differ between summer and winter to maintain the natural cycle to which the species is adapted. Marginated tortoises spend the winter in hiding, entering a state of torpor. I will discuss hibernation and winter temperatures in a moment, but first, let’s look at the conditions that should be provided in summer.
The temperature in a marginated tortoise’s terrarium should vary, but the difference between the warmest and coolest areas should not exceed about 10°C. At one end, directly beneath the heating lamp, the temperature should reach around 35°C at the heat source, gradually decreasing to about 25°C at the opposite end. This gradient provides distinct zones, allowing the tortoise to choose the spot where it feels most comfortable, while also preventing it from experiencing sudden temperature changes as it moves around the terrarium. It is important to note that the spot temperature of 35°C refers to the heated surface (or the shell of a basking tortoise) and the air immediately surrounding it. The temperature in the area around the heating point will be lower. At night in summer, temperatures should not drop below 15°C. Occasional cooler nights, however, will not harm a healthy tortoise.
Hibernation of the marginated tortoise
In its natural environment, the marginated tortoise enters a state of hibernation (brumation, a form of winter torpor). In captivity, it should also be allowed to rest in this way. Hibernation in tortoises usually lasts continuously until spring. However, in some populations of marginated tortoises, individuals may wake up during warmer periods and remain active as long as the weather permits. This behavior is observed in areas where, after the first significant drop in temperature in autumn, there are still several periods of noticeably warmer weather. In captivity, however, it is recommended to carry out one continuous hibernation, as it carries a lower risk of health problems for the animal.
Hibernation is a natural process that has a major impact on the lifespan, immunity, condition, and reproduction of tortoises. During this period, the metabolism slows down; the animal does not eat, but also does not burn many calories. This mechanism allows it to survive until conditions once again become favorable for normal activity.
Preparing a tortoise for hibernation requires careful planning. The animal must be healthy, well-nourished, and in good overall condition to cope with this demanding process. A weakened or sick individual may become ill during hibernation and, in some cases, may not wake up at all.
Preparing a marginated tortoise for hibernation
Preparing a marginated tortoise for hibernation requires optimal conditions in spring and summer, along with a rich and varied diet adapted to the annual cycle. In autumn, gradually reduce the amount of food and deworm the tortoise. About a month before the planned hibernation, slowly shorten the light cycle and limit feeding. Warm baths should also be given to help empty the digestive tract. Two weeks before hibernation, stop feeding altogether, give the tortoise its final warm bath, and move it to a cooler room with a temperature of 10–15°C. At this point, the light should also be turned off. The next stage is hibernation at a temperature of 4–5°C for 2–3 months. Awakening should also be gradual, though it takes much less time.
If the tortoise lives in an outdoor enclosure, preparation for hibernation and awakening can be left to occur naturally. However, it is extremely important to monitor the outside temperature during this period. In our climate, spring and autumn weather can be harsh and unpredictable. Alternating frosts and warm spells are not suitable conditions for a marginated tortoise. In such cases, it is better to provide safe conditions in a home terrarium.
To learn more about hibernating tortoises, see Winterign land and semiaquatic turtles.
Access to water and humidity in a marginated tortoise terrarium
The marginated tortoise (Testudo marginata) should always have access to a water pool. The pool should have low edges so the tortoise can enter easily, and its surface area must be large enough to fit the animal inside. The depth should not be too great, as this species cannot swim. Marginated tortoises enter the water mainly to moisten themselves and cool down on hot, dry days, but they usually do not stay in it for long. They more often use the pool for drinking, so the water should be changed daily, or more often if it becomes dirty.
The pool should be heavy enough not to be knocked over accidentally, which could temporarily block access to water. Proper placement is also important: it should be in a cooler part of the terrarium, away from the heat lamp. Otherwise, heated water may cause excessive and uncontrolled increases in humidity during the day.
The air humidity in a marginated tortoise terrarium should stay within 40–60%. These levels are usually maintained naturally through evaporation from the water pool and the substrate. However, it is sometimes necessary to spray the tank in the morning or evening to mimic the effect of dew. It is also a good idea to create zones with varying humidity levels, spraying more generously in the cooler part of the terrarium, where water does not evaporate as quickly.
Food for a marginated tortoise
The marginated tortoise (Testudo marginata) is herbivorous and, like other tortoises of this genus, feeds mainly on grasses and meadow plants. During dry summers, much of the vegetation withers, and at this time its primary food source becomes dry plant matter. The digestive system of the marginated tortoise is adapted to processing fiber-rich foods. Its natural diet is low in protein, fat, and sugar, which means vegetables and fruits should not be offered. In captivity, the diet should be as close as possible to that found in the wild. An improper diet can lead to a range of health problems, from digestive disorders to abnormal development.
The diet should be richest in spring, immediately after hibernation. At this time, fresh plants and young shoots should dominate, and the tortoise should have constant access to food. In summer, dried plants and granules can be introduced. During periods of heat and drought, this species becomes less active and feeds less, often hiding from high temperatures. Once the heat subsides, its appetite returns to normal. In autumn, before hibernation, food intake should be gradually reduced. This natural feeding cycle helps prepare the tortoise’s body for hibernation and ensures the proper annual rhythm. Food should be offered in a flat bowl to prevent the animal from swallowing substrate. You can also plant clumps of grasses and herbs directly into the substrate in the terrarium, which provides additional enrichment for your tortoise.
Commercial plant-based foods for marginated tortoises should be rich in vitamins A and D3 and contain a calcium-to-phosphorus ratio of 2:1. These qualities are present in Tropical Biorept L and Tropical Reptiles Herbivore foods. For more information on diet, see What to feed herbivorous tortoises?
When feeding marginated tortoises fresh and dried plants, calcium carbonate supplements should also be provided. These are available in powder form, which can be sprinkled on food (e.g., Tropical Vigorept Mineral and Tropical Vigorept Multivit), as well as in the form of cuttlebone pieces (known as sepia). Cuttlebone is an excellent option, as it can remain in the terrarium at all times, allowing the tortoise to use it whenever it needs. Additionally, gnawing on cuttlebone helps the tortoise naturally wear down its horny beak.
Does the marginated tortoise get sick?
Like any animal, the marginated tortoise can become ill or require special care. Many health problems arise from improper husbandry, and diet also has a major influence on the tortoise’s well-being. Some illnesses may result from weakened immunity or viral infections.
One of the most common health issues in this species is respiratory infections, usually caused by sudden daily temperature changes or excessive temperature fluctuations in the enclosure. If left untreated, these can lead to more serious complications. Like other tortoise species, marginated tortoises can also develop rickets if they do not receive proper lighting, nutrition, and supplementation. Parasitic infections, both internal and external (such as mites), are another potential concern.
Any alarming symptoms should be noticed quickly by the keeper, as early detection greatly improves the chances of recovery. Preventive veterinary checkups are also advisable, along with regular stool examinations.
Is a marginated tortoise a good choice for beginners?
The marginated tortoise (Testudo marginata) is often recommended as a first tortoise, as it is relatively easy to care for. However, it must be remembered that tortoises have specific needs that must always be met. Even with a hardy species, mistakes can easily occur. For this reason, thorough preparation and knowledge are essential before deciding to bring one home.
Based on personal experience and literature.
Literature
- Reptile database: https://reptile-database.reptarium.cz/species?genus=Testudo&species=marginata.
- Global Biodiversity Information Facility: https://www.gbif.org/species/2441502.
- Online encyclopedia: https://en.wikipedia.org/wiki/Marginated_tortoise.
- Schuiten B. I. 2008. Animals in the terrarium, trans. Borycka-Zakrzewska J. (Wydawnictwo REA, 2011), 107-120.
- Terrarium keeping: https://www.terrarium.com.pl/testudo-marginata-zolw-obrzezony/#Warunki_w_niewoli.
- Ullrich W. 2001. Amphibians and reptiles in terrariums, trans. Karwat M. (Agencja Wydawnicza Jerzy Mostowski, 2005), 104-109.
- Yellow-footed tortoise (Chelonoidis denticulatus) – a beauty from South America - November 20, 2025
- Marginated tortoise (Testudo marginata) – the largest land tortoise in Europe - October 22, 2025
- Wintering land and semi-aquatic turtles - August 18, 2025
