Raising Grassland Species of Tortoises
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Raising Grassland Species of Tortoises By Jennifer Greene
With the advances in tortoise husbandry over the last few decades, more and more captive bred baby tortoises of numerous species are becoming more readily available. Having captive bred baby tortoises to start with as pets is typically much easier than trying to acclimate wild caught specimens; however, a new problem arises with the care of baby tortoises as compared to their sub adult/ adult wild-caught counterparts. This problem is the raising of baby tortoises in a way that results in adult animals that exhibit the same level of health in terms of weight, shell condition, and longevity that their wild counterparts experience. Initially, many keepers could not keep baby tortoises alive, with many babies dying while being kept in the same conditions that adults were thriving in. Some keepers were able to raise babies, but they developed minor to severe shell deformities, known as "pyramiding", or the babies they raised experienced significantly shortened lifespans, living only 10 to 20 years compared to the often 100 year life span of wild tortoises. This article aims to cover some of the more recent advances in neonate and young tortoise husbandry, with the goal of helping keepers better raise their tortoises to healthy and long lasting adulthood.
One aspect of raising baby tortoises that is often overlooked initially is the natural history of where the particular species is from, and the conditions in that climate at the time the eggs usually hatch. This is important to note, as certain species inhabit extremely different microclimates as hatchlings compared to their adult counterparts. One such example is the Sulcata Tortoise, or African Spur Thigh Tortoise. Adults graze the grasslands of the savannah, often going for prolonged periods without water and tolerating extreme heat. Neonates kept in similar conditions with little access to water and extreme heat end up with high mortality rates and stunted or deformed animals. Similarly, neonate Greek Tortoises from the extreme north of their range typically hatch later in the season, and often spend a significant amount of time (up to several months) hidden in their incubation burrows, absorbing their yolk before going straight into their first hibernation season. (Kuzmin, 98)
With this in mind, be sure to thoroughly do your research before bringing home a baby tortoise. There are some general guidelines that can apply to many species within an ecological niche, but beginners are advised to look for a reputable specialist in their preferred species, or to purchase appropriate books geared towards the species they aim to keep. For species adapted to the grassland climate, including but not limited to Greek Tortoises (Testudo graeca), Russian Tortoises (Testudo horsfieldii, or Agrionemys horsfieldii in Russian literature), Sulcata Tortoises (Geochelone sulcata), and Marginated Tortoises (Testudo marginata), there are some general guidelines that can be used when raising hatchling tortoises. A cage large enough to allow the babies to explore and forage is highly recommended; I typically prefer cages with a 24" x 24" footprint as a good starter size for young tortoises.
A cage this size allows enough floor space to provide the various microclimates within the enclosure that will ensure your baby tortoise thrives. This size cage also allows for a wide range of temperatures, ideal for your baby tortoise to select the exact conditions within the cage it needs. It is possible to use a smaller cage, or one that is narrower, but it will require more work to adjust the lighting and heating elements on behalf of the tortoise. This size cage can be achieved with a glass terrarium (covering one or more sides is recommended, so as to prevent your tortoise from constantly attempting to go through the glass), tortoise table, or custom enclosure. Similar floor space in the form of a 36" x 12" cage is also an option, but do keep in mind as an entirely terrestrial animal your tortoise will appreciate having as much floor space as possible. In addition to traditional glass tanks, there are also various custom cages and tubs available that are specially designed for tortoises. Choose what works best for you!
When it comes to lighting your baby tortoise, which bulbs you use and what wattages are used depends on your cage size and setup. Tortoises, being diurnal reptiles, require not only heat but UVB as well. There are two methods for providing this for your tortoise, either through a combination of basking lights and fluorescent bulbs, or with the use of a mercury vapor bulb. Which you use depends on your tortoises, and size of cage. In a larger cage, either 24" x 24" or 36" x 12" or bigger, you can use a mercury vapor bulb. Mercury vapor bulbs, commonly abbreviated as MVBs, greatly simplify your lighting situation in addition to providing large amounts of visible light, UVB, and heat. These types of bulbs are ideal for desert and grassland species of tortoises, but because they do emit so much heat, keep in mind you will need to monitor humidity more closely. In smaller cages, or if you want to use a lower wattage bulb (mercury vapor bulbs do not come in wattages below 100), you will need to use a basking bulb in conjunction with a fluorescent tube light to provide heat, light, and UVB. A benefit of using this method of lighting is that you can plug your basking light into a thermostat or rheostat, and more accurately control temperature that way.
One aspect of keeping that has changed significantly over the last few years as compared to early attempts at raising tortoises is the level of humidity recommended for maintaining hatchlings. Some breeders maintain babies of all grassland species with higher humidity continuously while they are young, while others prefer a regimen of regular soaking. Alternatively, you can maintain a humid hide within the cage, which allows your baby tortoise to seek out an area of significantly higher humidity when it desires. This area of increased humidity can be provided by the addition of damp New Zealand Sphagnum moss, or adding moistened coconut fiber to a section of the cage. The addition of compressed coconut to the usual bedding (typically bark or chipped aspen in most cases) also offers your baby tortoise the option to dig, and excavate its own hiding place. It has been noted among some keepers that babies raised with the option of seeking out increased humidity often have smoother shells in better condition, which is something to consider when creating your tortoise setup.
Depending on which publication you consult, soaking regimens should consist of soaking your tortoise as often as twice a week (Leopard-, Vetter, 104) to only two to six times per month (Hermann's, Vetter, 159). Careful observation of your own tortoise(s) and their growth rates and overall health will help you determine just how often to soak your own tortoise. Regularly misting the cage in the morning to create a morning spike in humidity should also be considered beneficial for young tortoises; a similar spike in humidity occurs in the wild during the morning, and this will help the cage from becoming completely bone dry from the use of heat lights. Moisture is important for Mediterranean species of tortoises, such as the Hermann's tortoises. "Keeping the juveniles in conditions that are too dry results in a malformed growth of the shell even if they are properly supplied with vitamins and minerals." (Hermann's, Vetter, 157) This observation applies to the African species as well, "keeping juveniles in an inappropriately dry environment causes an increasingly humped appearance of the carapace." (Leopard-, Vetter, 109) With this in mind, while your grassland tortoise does not need to be kept at tropical levels of humidity, do pay some attention to maintaining a level of humidity between 60 and 75% a majority of the time.
The feeding and supplementation of tortoises is often a controversial topic among keepers, with each breeder and keeper having their own ideas and methods about nearly every aspect of the topic. Diet and supplementation of tortoises is such a large, diverse topic that a book should be dedicated to fully cover it, so I will only touch on key points here. The first and foremost point is that supplementation should be included in your tortoise's diet in some way, period. The method of supplementation differs based on tortoise size and species. One recommended method of providing calcium and added vitamins is not to dust the food directly, but instead offer calcium in the form of calcium blocks, cuttlebones, mussel grit, whetstones (for birds), or crushed eggshells. The thought behind this is that dusting the food itself "forces" calcium on the tortoises in quantities they may not experience in the wild, and as yet it is still unknown what the correct dosage of calcium really is. (Leopard-, Vetter, 95)
If you do dust the food, be sure to dust lightly with a mix of calcium and vitamins recommended for vegetarian reptiles. A light sprinkle, such as a fraction of a teaspoon, is more than enough for hatchling tortoises. It is important not to skip supplementation entirely - while yes, over supplementation can adversely affect your tortoise's health, not supplementing at all is equally as risky.
It is important to keep in mind when feeding grassland species of tortoises that in the wild, they roam vast distances eating plant matter that is rather low in nutrition content. This means they eat lots of food, but get little from it - when raised in captivity with the rich diet most keepers provide for their tortoises, babies often grow unnaturally fast. With this rapid growth comes "an increased susceptibility to diseases" (Hermannâ€™s, Vetter, 159), and as a result excessively rapid growth should be avoided. This can be done by reducing the amount of fresh, leafy green produce provided and instead offer hay and grasses. For the larger species of grassland tortoises, such as Sulcatas and Leopard Tortoises, it is recommended that "Green feed should never be offered fresh or even wet. It is always best to leave it to wilt slightly." (Leopard-, Vetter 105) This is the condition that baby tortoises would find their food most often in the wild, and should be replicated to a certain extent with captive babies. The addition of pelleted food to the diets is also an option, with ZooMed and Mazuri both offering excellent diets designed specifically for grassland species of tortoises. If your babies are stubborn, and refuse to eat their dried food or hay, a little tough love will often fix the problem. You can also mix dried food and hay in with fresh and wet food, which will help make it more appealing. Once your baby is accustomed to eating hay, offering it becomes much easier. In addition to offering hay as a food item, consider liberally covering up to half of the cage with loose grass hay. For smaller species of grassland tortoises, such as the Hermann's, Greek, or Russian tortoises, this mimics the kind of leaf litter and dead grass they would normally be hiding under and foraging through in the wild. The added security of being able to burrow under hay will help ensure your baby tortoise thrives in your care.
Lastly, consider housing your baby tortoises at least part of the time outdoors. On warm, sunny days between 75 and 90 degrees, keeping your babies outdoors to experience some natural sunlight can be extremely beneficial. It is mandatory that they have the option to escape from the sun, and any good commercially made Tortoise PlayPen or similar item will provide a hiding spot with its design. Due to their delicate nature, baby tortoises should not be left outdoors completely unsupervised. Make sure someone is always home to keep an eye on the tortoise(s) when they are outdoors, not only to make sure they do not get too hot or too cold, but to prevent predation and theft.
Being familiar with your particular species of tortoise will help you determine appropriate weather conditions; wild Sulcatas for example never hibernate or experience the same level of cool weather that Russian tortoises do. As such, they cannot tolerate the same cooler temperatures that Russian tortoises do. Always carefully monitor your tortoises when they are outdoors.
In closing, there have been huge advances in the captive husbandry of neonate tortoises, making it considerably easier for even the novice keeper to raise a pet tortoise up from a hatchling. As long as research is done to prepare for your preferred species, and the correct conditions are provided, a baby tortoise is no more or less difficult to care for than any other reptile species. Buy a book, join a tortoise club, participate with specialized online forums, educate yourself on your tortoise before bringing it home. And of course - when you do get it home, enjoy it!
Sergius L. Kuzmin The Turtles of Russia and Other Ex-SovietRepublics. Frankfurt am Main: Chimaira 2002
Holger Vetter Hermann's Tortoise, Boettger's and Dalmation Tortoises Frankfurt am Main: Chimaira 2006
Holger Vetter Leopard and African Spurred Tortoise Frankfurt am Main: Chimaira 2005